diff --git a/tools/chatgui/src/member_files/browser.cpp b/tools/chatgui/src/member_files/browser.cpp
index dc80baa7..34d840fd 100644
--- a/tools/chatgui/src/member_files/browser.cpp
+++ b/tools/chatgui/src/member_files/browser.cpp
@@ -22,6 +22,7 @@
 #include <QMenu>
 #include <QTimer>
 #include <QPointer>
+#include <QRunnable>
 #include <QLocale>
 #include <limits>
 #include <cstring>
@@ -45,6 +46,7 @@ static bool copyPath(char* out, const QString& value) {
 }
 
 MemberFileBrowser::MemberFileBrowser(DbManager* db, QWidget* parent) : QDialog(parent), m_db(db) {
+    m_uploadPool.setMaxThreadCount(1);
     setAttribute(Qt::WA_DeleteOnClose); setWindowTitle(text("Group files")); resize(940, 600);
     auto* layout = new QVBoxLayout(this);
     auto* selectors = new QHBoxLayout;
@@ -108,6 +110,7 @@ MemberFileBrowser::~MemberFileBrowser() {
     cancel(); cancelRequest(m_listId);
     cancelRequest(m_quotaId);
     for (auto id : m_actions.keys()) cancelRequest(id);
+    m_uploadPool.waitForDone();
 }
 
 void MemberFileBrowser::setChannel(const QString& channel, quint64 selectedOwner) {
@@ -411,7 +414,23 @@ void MemberFileBrowser::beginUploads(const QStringList& paths, bool chooseServer
     DEBUG_INFO(DEBUG_CATEGORY_MEDIA, "file browser: upload queue started batch=%llu group=%llu server=%llu owner=%llu path=%s files=%d",
         (unsigned long long)m_uploadBatchId, (unsigned long long)m_group, (unsigned long long)server(),
         (unsigned long long)owner(), qPrintable(m_path), m_uploadTotal);
-    nextUpload();
+    m_uploadStatus->setText(text("Checking selected files…"));
+    quint64 batch = m_uploadBatchId; QStringList sources = m_uploadQueue;
+    m_uploadPool.start(QRunnable::create([this, batch, sources] {
+        QString invalid;
+        for (const auto& source : sources) {
+            QFileInfo info(source);
+            if (!info.isFile() || info.isSymLink() || !info.isReadable()) { invalid = source; break; }
+        }
+        QMetaObject::invokeMethod(this, [this, batch, invalid] {
+            if (m_uploadBatchId != batch) return;
+            if (!invalid.isEmpty()) {
+                DEBUG_WARN(DEBUG_CATEGORY_MEDIA, "file browser: source rejected path=%s (not a readable regular file)", qPrintable(invalid));
+                finishUploads(text("Cannot upload %1. Select readable files, not folders or links.").arg(invalid)); return;
+            }
+            nextUpload();
+        }, Qt::QueuedConnection);
+    }));
 }
 
 void MemberFileBrowser::nextUpload() {
diff --git a/tools/chatgui/src/member_files/browser.h b/tools/chatgui/src/member_files/browser.h
index 0533bd2e..6f492d92 100644
--- a/tools/chatgui/src/member_files/browser.h
+++ b/tools/chatgui/src/member_files/browser.h
@@ -1,11 +1,12 @@
-/* Браузер серверных файлов группы. Виджет не выполняет файловое/сетевое I/O:
- * запросы уходят в uasync, передачи — в общий дисковый поток member_files.
+/* Браузер серверных файлов группы. GUI-поток не выполняет файловое/сетевое I/O:
+ * проверка локальных путей — QThreadPool, запросы — uasync, передачи — дисковый поток member_files.
  * Контекст и request_id защищают от поздних ответов после перехода в другой каталог. */
 #pragma once
 #include <QDialog>
 #include <QHash>
 #include <QByteArray>
 #include <QStringList>
+#include <QThreadPool>
 #include <cstdint>
 class DbManager;
 class QComboBox;
@@ -55,6 +56,7 @@ private:
     bool m_openAfter = false;
     quint64 m_uploadBatchId = 0, m_uploadStatId = 0;
     QStringList m_uploadQueue;
+    QThreadPool m_uploadPool;
     int m_uploadDone = 0, m_uploadSkipped = 0, m_uploadTotal = 0;
     int m_staleRetries = 0;
     QHash<quint64, uint8_t> m_actions;