diff --git a/web/client/src/sections/superAgent/components/SuperAgentInputBar.jsx b/web/client/src/sections/superAgent/components/SuperAgentInputBar.jsx
index 52b8a6e..023cf21 100644
--- a/web/client/src/sections/superAgent/components/SuperAgentInputBar.jsx
+++ b/web/client/src/sections/superAgent/components/SuperAgentInputBar.jsx
@@ -17,7 +17,7 @@
 
 import React from "react";
 import { Button, Input, Progress, Space, Tag, Upload } from "antd";
-import { StopOutlined } from "@ant-design/icons";
+import { CloseOutlined, StopOutlined } from "@ant-design/icons";
 import SendIcon from "@assets/img/newAiChat/icon (3).png";
 import FileUploadIcon from "@assets/img/aichat/file_upload.png";
 
@@ -34,6 +34,7 @@ const SuperAgentInputBar = ({
    isStreamingAnswer,
    handleUploadFile,
    handleRemoveUploadedFile,
+   handleCancelUpload,
    handleSend,
    handleStopAnswer,
 }) => {
@@ -108,11 +109,14 @@ const SuperAgentInputBar = ({
                      beforeUpload={handleUploadFile}
                      showUploadList={false}
                   >
-                     <Button title="上传文件">
+                     <Button title="上传文件" disabled={isUploadingFile}>
                         <img src={FileUploadIcon} alt="" />
                         上传文件
                      </Button>
                   </Upload>
+                  {isUploadingFile ? (
+                     <Button icon={<CloseOutlined />} onClick={handleCancelUpload} title="取消上传" />
+                  ) : null}
                </Space>
                <Button
                   type="primary"
diff --git a/web/client/src/sections/superAgent/container/index.jsx b/web/client/src/sections/superAgent/container/index.jsx
index 80d0041..568c4d5 100644
--- a/web/client/src/sections/superAgent/container/index.jsx
+++ b/web/client/src/sections/superAgent/container/index.jsx
@@ -488,6 +488,7 @@ const SuperAgent = () => {
       handleSelectTaskType,
       handleUploadFile,
       handleRemoveUploadedFile,
+      handleCancelUpload,
       handleSelectTask: selectLegacyTask,
       handleSelectChat: selectLegacyChat,
    } = chat;
@@ -1438,13 +1439,14 @@ const SuperAgent = () => {
       const userInput = inputValue.trim();
       const currentFileList = uploadedFileList;
       const attachmentIds = Array.from(new Set(
-         currentFileList.map((file) => file.attachmentId).filter(Boolean)
+         currentFileList
+            .filter((file) => file.status === "ready")
+            .map((file) => file.attachmentId)
+            .filter(Boolean)
       ));
-      const fileReferences = currentFileList
-         .map((file) => file.url || file.localPath || file.name)
-         .filter(Boolean)
-         .join("\n");
-      const content = [fileReferences, userInput].filter(Boolean).join("\n");
+      const content = userInput || (attachmentIds.length
+         ? `请处理已上传的附件：${currentFileList.map((file) => file.name).filter(Boolean).join("、")}`
+         : "");
       const generatedInterrupt = activeGeneratedInterrupt;
       if (generatedInterrupt?.value?.type === "generated_ui_interrupt" && userInput) {
          if (stream.isLoading) return;
@@ -2648,6 +2650,7 @@ const SuperAgent = () => {
                      isStreamingAnswer={isStreamingAnswer}
                      handleUploadFile={handleUploadFile}
                      handleRemoveUploadedFile={handleRemoveUploadedFile}
+                     handleCancelUpload={handleCancelUpload}
                      handleSend={handleSend}
                      handleStopAnswer={handleStopAnswer}
                   />
diff --git a/web/client/src/sections/superAgent/hooks/useSuperAgentChat.js b/web/client/src/sections/superAgent/hooks/useSuperAgentChat.js
index 5190eca..9878694 100644
--- a/web/client/src/sections/superAgent/hooks/useSuperAgentChat.js
+++ b/web/client/src/sections/superAgent/hooks/useSuperAgentChat.js
@@ -24,9 +24,12 @@ import {
    deleteSuperAgentSession,
    respondSuperAgentCheckpointStream,
    sendSuperAgentChat,
-   uploadSuperAgentFile,
 } from "../actions/api";
-import { createResourceFileFromUpload } from "../actions/resourceLibrary";
+import {
+   completeAttachmentUpload,
+   createAttachmentUploadIntent,
+   listAttachments,
+} from "../actions/agentResources";
 import useSuperAgentSidebar from "./useSuperAgentSidebar";
 import {
    TASK_STAGE,
@@ -62,6 +65,11 @@ import {
 } from "../utils/workspace";
 import { normalizeCheckpoint } from "../utils/checkpoint";
 import { isWorkflowBodyText } from "../utils/tenderWorkflow";
+import {
+   calculateFileSha256,
+   normalizeAttachmentUploadIntent,
+   uploadFileToIntent,
+} from "../utils/attachmentUpload";
 
 const getActionData = (res) => {
    const payload = res?.payload ?? res;
@@ -76,41 +84,19 @@ const ensureActionSuccess = (res, fallbackMessage) => {
    return getActionData(res);
 };
 
+const toReadyUploadedFile = (attachment) => ({
+   id: String(attachment.id || attachment.attachment_id || attachment.attachmentId),
+   attachmentId: String(attachment.id || attachment.attachment_id || attachment.attachmentId),
+   name: attachment.file_name || attachment.filename || "未命名文件",
+   status: attachment.status,
+});
+
 const buildSessionParams = (sessionId) => ({
    conversationId: sessionId,
    sessionId,
    ":sessionId": sessionId,
 });
 
-const hasFilePathPrefix = (filePath = "") => {
-   return /^(https?:)?\/\//i.test(filePath) || /^(data|blob):/i.test(filePath);
-};
-
-const buildQiniuFilePath = (filePath = "") => {
-   const cleanFilePath = String(filePath || "").trim();
-   if (!cleanFilePath || hasFilePathPrefix(cleanFilePath)) return cleanFilePath;
-
-   const qiniuDomain = window?.env?.FS_QINIU_DOMAIN || "";
-   const cleanDomain = String(qiniuDomain || "").replace(/\/+$/, "");
-   if (!cleanDomain) return cleanFilePath;
-
-   return `${cleanDomain}/${cleanFilePath.replace(/^\/+/, "")}`;
-};
-
-//[文件上下文] 上传文件只向智能体传递访问地址，不附加固定业务文案。
-const buildUploadedFileReference = (fileList = []) => {
-   return fileList
-      .map((file) => {
-         const fileName = file?.name || file?.originalFilename || "未命名文件";
-         const rawFilePath = file?.url || file?.path || file?.objectKey || file?.localPath || "";
-         const filePath = buildQiniuFilePath(rawFilePath);
-         if (!filePath) return "";
-         return `（文件名：${fileName}，文件路径：${filePath}）`;
-      })
-      .filter(Boolean)
-      .join("\n");
-};
-
 const useSuperAgentChat = ({
    currentUserId,
    openAuthModal,
@@ -156,6 +142,7 @@ const useSuperAgentChat = ({
    const streamingMessageKeyRef = useRef("");
    const chatRunPromiseRef = useRef(Promise.resolve());
    const chatRunActiveRef = useRef(false);
+   const uploadAbortControllerRef = useRef(null);
    const creatingSessionRef = useRef(false);
    const sidebarRefreshTimerRef = useRef(null);
    const artifactProgressSessionRef = useRef("");
@@ -168,6 +155,33 @@ const useSuperAgentChat = ({
       activeSessionIdRef.current = activeSessionId;
    }, [activeSessionId]);
 
+   useEffect(() => {
+      const conversationId = String(activeConversationId || "");
+      if (!conversationId) {
+         setUploadedFileList([]);
+         return undefined;
+      }
+      let active = true;
+      listAttachments(conversationId)
+         .then((page) => {
+            if (!active) return;
+            setUploadedFileList(
+               page.items
+                  .filter((attachment) => attachment.status === "ready" && !attachment.message_id)
+                  .map(toReadyUploadedFile)
+            );
+         })
+         .catch((error) => {
+            superAgentWarn("chat.upload", "attachment_list_failed", {
+               conversationId,
+               error: error?.message,
+            });
+         });
+      return () => {
+         active = false;
+      };
+   }, [activeConversationId]);
+
    const activeTask = useMemo(
       () => taskList.find((task) => task.id === activeTaskId) || null,
       [activeTaskId, taskList]
@@ -357,6 +371,9 @@ const useSuperAgentChat = ({
          if (chatAbortControllerRef.current) {
             chatAbortControllerRef.current.abort();
          }
+         if (uploadAbortControllerRef.current) {
+            uploadAbortControllerRef.current.abort();
+         }
          if (sidebarRefreshTimerRef.current) {
             window.clearTimeout(sidebarRefreshTimerRef.current);
          }
@@ -398,6 +415,7 @@ const useSuperAgentChat = ({
       folderId = null,
       title = "",
       shouldResetMessages = false,
+      returnConversationId = false,
    } = {}) => {
       if (!currentUserId) {
          openAuthModal("login");
@@ -469,7 +487,7 @@ const useSuperAgentChat = ({
       }
 
       await loadSidebar({ silent: true });
-      return nextSessionId;
+      return returnConversationId ? nextSessionId : nextThreadId;
    };
 
    const getCurrentSessionType = () => {
@@ -1545,14 +1563,14 @@ const useSuperAgentChat = ({
 
    //[执行上传文件的实际逻辑]
    const performUpload = (file, fileName, currentSessionType) => {
-      const currentSessionId = activeSessionId || activeTaskId;
-      const shouldCreateSession = !currentSessionId;
+      const currentConversationId = activeConversationId || activeTaskId;
+      const shouldCreateSession = !currentConversationId;
       const shouldUseTaskSession =
          currentSessionType === "task" || (shouldCreateSession && isTaskRoute);
       const shouldCreateNewTask = shouldCreateSession && shouldUseTaskSession;
       superAgentLog("chat.upload", "perform.start", {
          fileName,
-         currentSessionId,
+         currentConversationId,
          currentSessionType,
          shouldCreateSession,
          shouldUseTaskSession,
@@ -1583,23 +1601,32 @@ const useSuperAgentChat = ({
             status: "preparing",
          });
          try {
-            const sessionId =
-               currentSessionId ||
+            const conversationId =
+               currentConversationId ||
                (await createAndActivateSession({
                   isTaskSession: shouldUseTaskSession,
                   title: shouldUseTaskSession
                      ? fileName.replace(/\.[^.]+$/, "") || "AI 标书任务"
                      : "",
+                  returnConversationId: true,
                }));
             superAgentLog("chat.upload", "session.ready", {
-               sessionId,
+               conversationId,
                fileName,
                shouldUseTaskSession,
             });
-            const uploadResult = await uploadSuperAgentFile({
-               sessionId,
-               userId: currentUserId,
-               file,
+            const sha256 = await calculateFileSha256(file);
+            const uploadIntent = normalizeAttachmentUploadIntent(
+               await createAttachmentUploadIntent(conversationId, {
+                  file_name: fileName,
+                  mime_type: file.type || "application/octet-stream",
+                  file_size: Number(file.size || 0),
+                  ...(sha256 ? { sha256 } : {}),
+               })
+            );
+            uploadAbortControllerRef.current = new AbortController();
+            await uploadFileToIntent(uploadIntent, file, {
+               signal: uploadAbortControllerRef.current.signal,
                onProgress: (progress) => {
                   setUploadProgress({
                      fileName,
@@ -1613,57 +1640,36 @@ const useSuperAgentChat = ({
                percent: 100,
                status: "processing",
             }));
-            const uploadData = uploadResult?.data || uploadResult || {};
-            try {
-               await createResourceFileFromUpload(uploadData);
-            } catch (resourceError) {
-               superAgentWarn("chat.upload", "resource_library_save_failed", {
-                  fileName,
-                  error: resourceError?.message,
-               });
-               message.warning("文件已上传，但保存到资源库失败");
+            const uploadData = await completeAttachmentUpload(uploadIntent.attachmentId);
+            const attachmentPage = await listAttachments(conversationId);
+            const readyAttachment = attachmentPage.items.find((attachment) =>
+               String(attachment.id || attachment.attachment_id || attachment.attachmentId) === uploadIntent.attachmentId
+            ) || uploadData?.data || uploadData || {};
+            if (readyAttachment.status !== "ready") {
+               throw new Error("附件尚未准备完成，请稍后重试");
             }
             const uploadedFileName =
-               uploadData.filename ||
-               uploadData.original_filename ||
-               uploadData.originalFilename ||
+               readyAttachment.file_name ||
+               readyAttachment.filename ||
+               readyAttachment.original_filename ||
+               readyAttachment.originalFilename ||
                fileName;
-            const rawUploadedFilePath =
-               uploadData.path ||
-               uploadData.url ||
-               uploadData.object_key ||
-               uploadData.objectKey ||
-               "";
-            const uploadedFilePath = buildQiniuFilePath(rawUploadedFilePath);
-            const uploadedLocalPath = uploadData.local_path || uploadData.localPath || "";
-            const uploadedFileStorage = uploadData.storage || "";
-            const normalizedUploadedFileStorage =
-               uploadedFileStorage || uploadData.storage_provider || uploadData.storageProvider || "";
             superAgentLog("chat.upload", "upload.done", {
-               sessionId,
+               conversationId,
                uploadedFileName,
-               uploadedFilePath,
-               uploadedLocalPath,
-               uploadedFileStorage: normalizedUploadedFileStorage,
-               uploadResult,
+               attachmentId: uploadIntent.attachmentId,
+            });
+            const uploadedFile = toReadyUploadedFile({
+               ...readyAttachment,
+               id: uploadIntent.attachmentId,
+               file_name: uploadedFileName,
+               status: "ready",
             });
-            const uploadedFile = {
-               id: `${sessionId}_${uploadedFileName}_${Date.now()}`,
-               attachmentId: uploadData.id || "",
-               name: uploadedFileName,
-               url: uploadedFilePath,
-               objectKey: uploadData.object_key || uploadData.objectKey || "",
-               localPath: uploadedLocalPath,
-               storage: normalizedUploadedFileStorage,
-            };
 
             if (shouldCreateNewTask) {
                updateActiveTask({
                   title: uploadedFileName.replace(/\.[^.]+$/, "") || "AI 标书任务",
                   fileName: uploadedFileName,
-                  filePath: uploadedFilePath,
-                  localPath: uploadedLocalPath,
-                  fileStorage: normalizedUploadedFileStorage,
                });
             }
 
@@ -1677,6 +1683,7 @@ const useSuperAgentChat = ({
             });
             message.error(error?.message || "上传文件失败");
          } finally {
+            uploadAbortControllerRef.current = null;
             setIsUploadingFile(false);
             setUploadProgress(null);
          }
@@ -1689,6 +1696,10 @@ const useSuperAgentChat = ({
       setUploadedFileList((prev) => prev.filter((file) => file.id !== fileId));
    };
 
+   const handleCancelUpload = () => {
+      uploadAbortControllerRef.current?.abort();
+   };
+
    const confirmBasicInfo = () => {
       superAgentLog("chat.confirm", "basic_info", { activeSessionId, activeTaskId });
       setTaskStage(TASK_STAGE.SCORE);
@@ -1727,8 +1738,9 @@ const useSuperAgentChat = ({
    const handleSend = () => {
       const userInput = inputValue.trim();
       const currentFileList = uploadedFileList;
-      const fileReferenceText = buildUploadedFileReference(currentFileList);
-      const finalMessage = [fileReferenceText, userInput].filter(Boolean).join("\n");
+      const finalMessage = userInput || (currentFileList.length
+         ? `请处理已上传的附件：${currentFileList.map((file) => file.name).filter(Boolean).join("、")}`
+         : "");
 
       if (!finalMessage || isStreamingAnswer) return;
 
@@ -1770,7 +1782,10 @@ const useSuperAgentChat = ({
          //[文件引用写入历史展示字段，刷新或切换会话后才能还原文件标签]
          displayContent: finalMessage,
          attachmentIds: Array.from(
-            new Set(currentFileList.map((file) => file.attachmentId).filter(Boolean))
+            new Set(currentFileList
+               .filter((file) => file.status === "ready")
+               .map((file) => file.attachmentId)
+               .filter(Boolean))
          ),
       });
    };
@@ -1887,6 +1902,7 @@ const useSuperAgentChat = ({
       handleTenderQuickStart,
       handleUploadFile,
       handleRemoveUploadedFile,
+      handleCancelUpload,
       confirmBasicInfo,
       confirmScoreItems,
       confirmCatalog,
diff --git a/web/client/src/sections/superAgent/utils/attachmentUpload.js b/web/client/src/sections/superAgent/utils/attachmentUpload.js
new file mode 100644
index 0000000..2b3377c
--- /dev/null
+++ b/web/client/src/sections/superAgent/utils/attachmentUpload.js
@@ -0,0 +1,94 @@
+/**
+ * Attachment upload primitives for the Agent upload-intent protocol.
+ */
+"use strict";
+
+const getPayload = (value) => value?.data ?? value ?? {};
+
+export const calculateFileSha256 = async (file) => {
+   if (!file?.arrayBuffer || !globalThis.crypto?.subtle?.digest) return "";
+   const buffer = await file.arrayBuffer();
+   const digest = await globalThis.crypto.subtle.digest("SHA-256", buffer);
+   return Array.from(new Uint8Array(digest))
+      .map((byte) => byte.toString(16).padStart(2, "0"))
+      .join("");
+};
+
+export const normalizeAttachmentUploadIntent = (response) => {
+   const payload = getPayload(response);
+   const upload = getPayload(payload.upload);
+   const attachment = getPayload(payload.attachment);
+   const attachmentId = attachment.id || payload.attachment_id || payload.attachmentId || payload.id || "";
+   const method = String(upload.method || "").toUpperCase();
+   if (!attachmentId || !upload.url || !["POST", "PUT"].includes(method)) {
+      throw new Error("上传意图响应不完整");
+   }
+   return {
+      attachmentId: String(attachmentId),
+      expiresAt: upload.expires_at || upload.expiresAt || payload.expires_at || payload.expiresAt || "",
+      upload: {
+         method,
+         url: upload.url,
+         fields: upload.fields && typeof upload.fields === "object" ? upload.fields : {},
+         headers: upload.headers && typeof upload.headers === "object" ? upload.headers : {},
+      },
+   };
+};
+
+export const isUploadIntentExpired = (intent, now = Date.now()) => {
+   if (!intent?.expiresAt) return false;
+   const expiresAt = Date.parse(intent.expiresAt);
+   return Number.isFinite(expiresAt) && expiresAt <= now;
+};
+
+export const uploadFileToIntent = (intent, file, { onProgress, signal } = {}) => {
+   if (isUploadIntentExpired(intent)) {
+      return Promise.reject(new Error("上传凭证已过期，请重新选择文件"));
+   }
+
+   return new Promise((resolve, reject) => {
+      const xhr = new XMLHttpRequest();
+      const abort = () => xhr.abort();
+      xhr.open(intent.upload.method, intent.upload.url);
+
+      Object.entries(intent.upload.headers || {}).forEach(([key, value]) => {
+         if (value !== undefined && value !== null && value !== "") {
+            xhr.setRequestHeader(key, String(value));
+         }
+      });
+      xhr.upload.onprogress = (event) => {
+         const total = Number(event.total || file?.size || 0);
+         const loaded = Number(event.loaded || 0);
+         onProgress?.({
+            loaded,
+            total,
+            percent: total > 0 ? Math.min(100, Math.round((loaded / total) * 100)) : 0,
+         });
+      };
+      xhr.onerror = () => reject(new Error("上传文件失败，请检查网络连接"));
+      xhr.onabort = () => reject(new Error("文件上传已取消"));
+      xhr.onload = () => {
+         if (xhr.status >= 200 && xhr.status < 300) {
+            resolve();
+            return;
+         }
+         reject(new Error(`文件直传失败（${xhr.status || "网络错误"}）`));
+      };
+      signal?.addEventListener("abort", abort, { once: true });
+      if (signal?.aborted) {
+         abort();
+         return;
+      }
+
+      if (intent.upload.method === "POST") {
+         const formData = new FormData();
+         Object.entries(intent.upload.fields || {}).forEach(([key, value]) => {
+            formData.append(key, String(value));
+         });
+         formData.append("file", file);
+         xhr.send(formData);
+         return;
+      }
+      xhr.send(file);
+   });
+};
diff --git a/web/tests/agentApiAdapter.test.mjs b/web/tests/agentApiAdapter.test.mjs
index 831d639..eeb2b55 100644
--- a/web/tests/agentApiAdapter.test.mjs
+++ b/web/tests/agentApiAdapter.test.mjs
@@ -15,6 +15,10 @@ const {
    shouldSendIdempotencyKey,
 } = await import("../client/src/sections/superAgent/utils/agentApiParse.js");
 const { superAgentServiceApiTable } = await import("../client/src/utils/superAgentApiTable.js");
+const {
+   isUploadIntentExpired,
+   normalizeAttachmentUploadIntent,
+} = await import("../client/src/sections/superAgent/utils/attachmentUpload.js");
 
 test("new api table uses live agent paths", () => {
    assert.equal(superAgentServiceApiTable.tasksets, "/tasksets");
@@ -54,6 +58,23 @@ test("uuid and page helpers normalize agent payloads", () => {
    assert.equal(shouldSendIdempotencyKey("GET", "k"), false);
 });
 
+test("attachment upload intent follows the v2 three-stage payload", () => {
+   const intent = normalizeAttachmentUploadIntent({
+      attachment: { id: "2c1f3c0e-1a2b-4c5d-8e9f-0123456789ab" },
+      upload: {
+         method: "POST",
+         url: "https://upload.example.test",
+         fields: { token: "opaque", key: "uploads/file.txt" },
+         expires_at: "2030-01-01T00:00:00Z",
+      },
+   });
+   assert.equal(intent.attachmentId, "2c1f3c0e-1a2b-4c5d-8e9f-0123456789ab");
+   assert.equal(intent.upload.method, "POST");
+   assert.equal(intent.upload.fields.key, "uploads/file.txt");
+   assert.equal(isUploadIntentExpired(intent, Date.parse("2029-01-01T00:00:00Z")), false);
+   assert.equal(isUploadIntentExpired(intent, Date.parse("2031-01-01T00:00:00Z")), true);
+});
+
 test("adapter source exchanges login token for agent jwt and omits identity headers", () => {
    const table = read("client", "src", "utils", "superAgentApiTable.js");
    const agentApi = read("client", "src", "sections", "superAgent", "utils", "agentApi.js");
@@ -61,6 +82,8 @@ test("adapter source exchanges login token for agent jwt and omits identity head
    const protocol = read("..", "api", "app", "controllers", "superAgentProtocol.js");
    const actions = read("client", "src", "sections", "superAgent", "actions", "api.js");
    const resources = read("client", "src", "sections", "superAgent", "actions", "agentResources.js");
+   const chatHook = read("client", "src", "sections", "superAgent", "hooks", "useSuperAgentChat.js");
+   const uploadUtils = read("client", "src", "sections", "superAgent", "utils", "attachmentUpload.js");
    assert.doesNotMatch(table, /\/api\/v1\/tasks/);
    assert.match(agentApi, /ACCESS_TOKEN_PATH = "\/_api\/super-agent\/access-token"/);
    assert.match(agentApi, /Authorization: `Bearer \$\{token\}`/);
@@ -75,5 +98,15 @@ test("adapter source exchanges login token for agent jwt and omits identity head
    assert.match(protocol, /\/threads\/\$\{encodeURIComponent/);
    assert.match(actions, /requestAgentJson/);
    assert.match(resources, /createAttachmentUploadIntent/);
+   assert.match(resources, /completeAttachmentUpload/);
+   assert.match(resources, /listAttachments/);
+   assert.match(chatHook, /createAttachmentUploadIntent\(conversationId/);
+   assert.match(chatHook, /completeAttachmentUpload\(uploadIntent\.attachmentId\)/);
+   assert.match(chatHook, /listAttachments\(conversationId\)/);
+   assert.match(chatHook, /attachment\.status === "ready" && !attachment\.message_id/);
+   assert.match(chatHook, /handleCancelUpload/);
+   assert.doesNotMatch(chatHook, /uploadSuperAgentFile/);
+   assert.match(uploadUtils, /FormData/);
+   assert.match(uploadUtils, /xhr\.send\(file\)/);
    assert.match(resources, /cancelThreadRun/);
 });