diff --git a/web/src/core-bridge/worker.ts b/web/src/core-bridge/worker.ts
index a75bcb6..0b65d99 100644
--- a/web/src/core-bridge/worker.ts
+++ b/web/src/core-bridge/worker.ts
@@ -109,9 +109,26 @@ async function dispatch(operation: string, input: unknown): Promise<unknown> {
   }
 }
 
+/**
+ * 账号和空间的操作按顺序执行(登录、同步、改设置等互相依赖)。但上传、发消息、删除、取消是长任务或互不依赖:
+ * 如果也排在这条队列里,一个大文件的 sendFiles 会让取消按钮、聊天消息、删除全部等到上传结束才生效。
+ */
+function laneOf(operation: string, payload: Record<string, unknown>): string | undefined {
+  const space = String(payload.id ?? '');
+  switch (operation) {
+    case 'cancelUpload': return undefined;
+    case 'sendFiles': return `upload:${space}`;
+    case 'sendText': case 'editChannelText': return `chat:${space}`;
+    case 'removeChannelItem': return `item:${space}`;
+    default: return 'account-scope';
+  }
+}
+
 scope.onmessage = (event) => {
   const request = event.data;
-  const task = serial('account-scope', () => dispatch(request.operation, request.payload));
+  const lane = laneOf(request.operation, request.payload as Record<string, unknown>);
+  const run = () => dispatch(request.operation, request.payload);
+  const task = lane ? serial(lane, run) : run();
   void task.then(
     (result) => scope.postMessage({ requestId: request.requestId, result }),
     (error: unknown) => scope.postMessage({
diff --git a/web/src/core-bridge/worker/uploadQueue.ts b/web/src/core-bridge/worker/uploadQueue.ts
index 3a370ab..b13df0d 100644
--- a/web/src/core-bridge/worker/uploadQueue.ts
+++ b/web/src/core-bridge/worker/uploadQueue.ts
@@ -3,6 +3,7 @@ import { dequeueFrame, dequeueItem, queueFrame, queueLocation, saveResource, typ
 import { errorMessage } from '../errors';
 import type { FileItem, FileUploadOptions } from '../types';
 import { prepareObject } from './channelDataKeys';
+import { removeChannelItem } from './channelItems';
 import { queueFileCatalog } from './channelThreads';
 import { deviceIdentity, publishWorkspace } from './presentation';
 import { senderSnapshot } from './senderSnapshot';
@@ -160,6 +161,8 @@ async function discard(resource: SavedResource, item: FileItem | undefined): Pro
   await saveResource(resource);
   blobs.delete(`${resource.id}:${item.id}`);
   publishWorkspace(resource.id, { t: 'removed', id: item.id });
+  // 服务端可能已收下前几帧:删掉这个没传完的条目,不然它会一直占着空间配额(没传完的条目服务端允许直接删)。第 0 帧都没到服务端时返回 404,忽略
+  void removeChannelItem(resource.id, item.id).catch(() => undefined);
 }
 
 /**
diff --git a/web/src/features/channel/ChatMessage.tsx b/web/src/features/channel/ChatMessage.tsx
index db073e4..84f4ebb 100644
--- a/web/src/features/channel/ChatMessage.tsx
+++ b/web/src/features/channel/ChatMessage.tsx
@@ -62,7 +62,7 @@ export function ChatMessage({ id, compact = false, onOpenFile, onDelete }: Props
           <Button variant="ghost" icon="eye" label="预览" disabled={!ready} onClick={() => onOpenFile(id)} />
           <Button variant="ghost" icon="download" label={downloading ? '下载中…' : '下载'} disabled={!ready || downloading} onClick={() => { void save(); }} />
         </div>}
-      {item.state.kind === 'receiving' && item.kind === 'file' ? <TransferProgress state={item.state} {...(self && item.localId ? { onCancel: () => { void cancelUpload(item.localId!); } } : {})} />
+      {item.state.kind === 'receiving' && item.kind === 'file' ? <TransferProgress state={item.state} {...(self && item.localId ? { onCancel: () => { void cancelUpload(item.localId!, item.id); } } : {})} />
         : failed ? <span className={styles.failure} role="alert">发送失败。<button type="button" onClick={() => { void retry(id); }}>重试</button></span>
           : item.state.kind === 'incomplete' ? <span className={styles.delivery}>发送未完成，等待续传。</span> : null}
     </div>
diff --git a/web/src/store/workspace.ts b/web/src/store/workspace.ts
index 4e250b0..02a032d 100644
--- a/web/src/store/workspace.ts
+++ b/web/src/store/workspace.ts
@@ -63,7 +63,7 @@ interface Actions {
   /** 重试发送失败的本地占位项 */
   retrySend: (localId: string) => Promise<void>;
   /** 取消排队中或上传中的文件 */
-  cancelUpload: (localId: string) => Promise<void>;
+  cancelUpload: (localId: string, itemId?: string) => Promise<void>;
   updateChannelSettings: (patch: ChannelSettingsPatch) => Promise<void>;
   sendFiles: (files: File[], options?: FileUploadOptions, threadId?: string, folderId?: string) => Promise<void>;
   createThread: (name: string, groupId?: string) => Promise<string>;
@@ -105,10 +105,12 @@ export const useWorkspace = create<WorkspaceData & Actions>()(() => ({
     return deliver(id);
   },
   retrySend: (id) => deliver(id),
-  cancelUpload: async (localId) => {
+  cancelUpload: async (localId, itemId) => {
     pendingJobs.delete(localId);
     useWorkspace.setState((s) => withoutItem(s, localId));
-    await api.cancelUpload(localId).catch(() => false);
+    const found = await api.cancelUpload(localId).catch(() => false);
+    // worker 里没有这个任务(上次会话遗留的半截上传):当普通条目删除
+    if (!found && itemId) { useWorkspace.setState((s) => withoutItem(s, itemId)); await api.remove(itemId).catch(() => undefined); }
   },
   updateChannelSettings: (patch) => api.updateChannelSettings(patch),
   sendFiles: async (files, options, threadId, folderId) => {
@@ -139,7 +141,13 @@ export const useWorkspace = create<WorkspaceData & Actions>()(() => ({
   moveItems: (itemIds, threadId, folderId) => api.moveItems(itemIds, threadId, folderId),
   editText: (id, t): Promise<void> => api.editText(id, t, useWorkspace.getState().byId[id]?.threadId),
   resolveConflict: (id, c) => api.resolveConflict(id, c),
-  remove: (id) => { if (!pendingJobs.has(id)) return api.remove(id); settleLocal(id); return Promise.resolve(); },
+  remove: async (id) => {
+    if (pendingJobs.has(id)) { settleLocal(id); await api.cancelUpload(id).catch(() => false); return; }
+    const item = useWorkspace.getState().byId[id];
+    // 还在上传的文件:删除就是取消(先停掉上传,否则后面的帧会打到已删除的条目上)
+    if (item?.kind === 'file' && item.state.kind === 'receiving') { await useWorkspace.getState().cancelUpload(item.localId ?? id, id); return; }
+    await api.remove(id);
+  },
   setSnapshot: (t) => api.setSnapshot(t),
   getBlob: (id, v) => api.getBlob(id, v),
   markSeen: (id) => api.markSeen(id),