diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74833bc5..94ab7686 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,10 @@
   （如 `C:\docs\(draft)\a.md`）或 `\\server\share` 共享路径被误当作 shell 转义、
   文件没有作为附件发送的问题；转义解析找不到文件时会改用原样粘贴的路径，
   并支持在文字中识别共享路径、保留其原始分隔符。
+- 修复 TUI 中提到不可达主机或不存在共享的 Windows 路径（如 `\\server\share\a.pdf`）
+  时整条消息报 `UNKNOWN: unknown error` 发不出去的问题；取不到的共享路径与本地
+  缺失路径一样按普通文字发送；仅放行 Windows UNC 的 stat 查找失败，实际读取和
+  权限错误仍正常提示。
 - WebUI 与共享移动端现在会在后台任务卡片中展示类型化 Artifact；支持远程媒体
   的显式加载、内联图片预览、结构化数据和可打开或下载的文件产物，并在语音播报
   完成或 Gateway 重连后继续保留产物入口。
diff --git a/tui/src/input-parts.mjs b/tui/src/input-parts.mjs
index bc987e91..bba07662 100644
--- a/tui/src/input-parts.mjs
+++ b/tui/src/input-parts.mjs
@@ -107,6 +107,16 @@ function pastedFilePaths(text) {
   return isAbsolute(value) || /^\.\.?[\\/]/.test(value) ? [value, literal] : []
 }
 
+// Windows 不可用共享的 stat 可能返回 UNKNOWN，而不是 ENOENT。
+// 只放行 UNC 查找失败；本地路径、权限及实际读取错误仍须报告。
+function unavailablePath(error) {
+  if (['ENOENT', 'ENOTDIR'].includes(error?.code)) return true
+  return process.platform === 'win32'
+    && error?.code === 'UNKNOWN'
+    && error.syscall === 'stat'
+    && /^\\\\(?![?.]\\)[^\\]+\\[^\\]+(?:\\|$)/.test(error.path || '')
+}
+
 // Windows 路径以 \ 分隔，C:\docs\(draft)\a.md 或 \\server\share 中的 \( 与 \\
 // 并不是 shell 转义。UNC 路径保留原样；其他路径优先按转义解析（如 cat\ image.png），
 // 该路径不存在时再尝试原样粘贴的文本。
@@ -116,7 +126,7 @@ async function filePartFromCandidates(paths, index) {
     try {
       return await filePartFromPath(path, index)
     } catch (error) {
-      if (!['ENOENT', 'ENOTDIR'].includes(error?.code)) throw error
+      if (!unavailablePath(error)) throw error
       missing ??= error
     }
   }
@@ -162,7 +172,7 @@ export async function inputPartsFromText(
     } catch (error) {
       // A missing pasted path may still be intentional text. Existing paths
       // that are directories, too large, or unreadable remain real errors.
-      if (!['ENOENT', 'ENOTDIR'].includes(error?.code)) throw error
+      if (!unavailablePath(error)) throw error
     }
   }
   if (!paths.length) {
@@ -179,7 +189,7 @@ export async function inputPartsFromText(
           value: part.source.text.value,
         })
       } catch (error) {
-        if (!['ENOENT', 'ENOTDIR'].includes(error?.code)) throw error
+        if (!unavailablePath(error)) throw error
       }
     }
     if (replacements.length) {
@@ -208,7 +218,7 @@ export async function inputPartsFromText(
       // A literal @mention is still ordinary text. Only an existing path is
       // promoted into a file part; explicit attachment selection still
       // surfaces invalid paths to the user through filePartFromPath().
-      if (!['ENOENT', 'ENOTDIR'].includes(error?.code)) throw error
+      if (!unavailablePath(error)) throw error
     }
   }
   return withAttachmentAnchors([
diff --git a/tui/test/input-parts.test.mjs b/tui/test/input-parts.test.mjs
index 4be37f77..adc82b5f 100644
--- a/tui/test/input-parts.test.mjs
+++ b/tui/test/input-parts.test.mjs
@@ -1,5 +1,7 @@
 import assert from 'node:assert/strict'
 import { mkdtemp, writeFile } from 'node:fs/promises'
+import fs from 'node:fs/promises'
+import { syncBuiltinESMExports } from 'node:module'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import test from 'node:test'
@@ -141,3 +143,61 @@ test('keeps ordinary @mentions as text when they are not paths', async () => {
   const parts = await inputPartsFromText('请问 @designer 的意见')
   assert.deepEqual(parts, [{ type: 'text', text: '请问 @designer 的意见' }])
 })
+
+test('only tolerates UNKNOWN for Windows UNC stat failures', async t => {
+  let failure
+  t.mock.method(fs, 'stat', async () => {
+    if (failure.syscall === 'stat') throw failure
+    return { isFile: () => true, size: 12 }
+  })
+  t.mock.method(fs, 'readFile', async () => { throw failure })
+  syncBuiltinESMExports()
+  t.after(() => {
+    t.mock.restoreAll()
+    syncBuiltinESMExports()
+  })
+
+  const local = join(tmpdir(), 'qwa-input-error.pdf')
+  const share = String.raw`\\server\share\report.pdf`
+  for (const path of [local, share]) {
+    for (const syscall of ['stat', 'read']) {
+      for (const code of ['UNKNOWN', 'EACCES']) {
+        failure = Object.assign(new Error('simulated filesystem error'), {
+          code, syscall, path,
+        })
+        // Cover direct paste, inline paste and explicit @mention on every OS.
+        for (const text of [local, `总结 ${local}`, `总结 @${local}`]) {
+          if (process.platform === 'win32' && path === share
+            && syscall === 'stat' && code === 'UNKNOWN') {
+            assert.deepEqual(await inputPartsFromText(text), [{ type: 'text', text }])
+          } else {
+            await assert.rejects(inputPartsFromText(text), error => error === failure)
+          }
+        }
+      }
+    }
+  }
+})
+
+test('keeps an unavailable Windows share as ordinary text', {
+  skip: process.platform !== 'win32',
+}, async () => {
+  // 本机一定可达，但共享名不存在：Windows 报 ERROR_BAD_NETPATH，
+  // Node 把它映射成 UNKNOWN 而不是 ENOENT。
+  const share = String.raw`\\127.0.0.1\qwen-audio-agent-missing-share\report.pdf`
+  assert.deepEqual(
+    await inputPartsFromText(share),
+    [{ type: 'text', text: share }],
+  )
+  const inline = `请看 ${share} 的数据`
+  assert.deepEqual(
+    await inputPartsFromText(inline),
+    [{ type: 'text', text: inline }],
+  )
+  assert.deepEqual(
+    await inputPartsFromText(`总结 @${share}`),
+    [{ type: 'text', text: `总结 @${share}` }],
+  )
+  // Explicit attachment selection must still surface the missing share.
+  await assert.rejects(filePartFromPath(share))
+})