diff --git a/app.py b/app.py
index ab2c2d7..a9953a1 100644
--- a/app.py
+++ b/app.py
@@ -973,29 +973,42 @@ def run_uploads(local_dir: Path, cfg: dict):
         root = _smb_conn(t)
         dest = _smb_conn(t, dest_root)
 
+        # Quellverzeichnis prüfen
+        if not local_dir.exists():
+            err = f'Quellverzeichnis nicht gefunden: {local_dir}'
+            add_log(f'Upload {name}: ✗ {err}')
+            with upload_lock:
+                upload_state['results'].append({'name': name, 'ok': False, 'msg': err})
+            continue
+
         # 1. Verbindung prüfen
         conn = _rclone('lsd', root, timeout=15)
+        add_log(f'Upload {name}: Verbindung rc={conn.returncode}')
         if conn.returncode != 0:
-            lines = [l for l in conn.stderr.strip().splitlines() if l.strip()]
-            err = lines[-1] if lines else 'NAS nicht erreichbar'
+            err = (conn.stderr.strip().splitlines()[-1] if conn.stderr.strip()
+                   else 'NAS nicht erreichbar')
             add_log(f'Upload {name}: ✗ {err}')
             with upload_lock:
                 upload_state['results'].append({'name': name, 'ok': False, 'msg': err})
             continue
 
         # 2. Zielordner anlegen
-        _rclone('mkdir', dest, timeout=30)
+        mk = _rclone('mkdir', dest, timeout=30)
+        add_log(f'Upload {name}: mkdir rc={mk.returncode}'
+                + (f' err={mk.stderr.strip()[:100]}' if mk.returncode != 0 else ''))
 
         # 3. Kopieren
+        add_log(f'Upload {name}: starte copy von {local_dir}')
         r = _rclone('copy', str(local_dir), dest,
                     '--create-empty-src-dirs',
-                    '--retries', '2',
+                    '--transfers', '1',
+                    '--retries', '1',
                     timeout=7200)
         ok  = r.returncode == 0
         err = ''
         if not ok:
-            lines = [l for l in r.stderr.strip().splitlines() if l.strip()]
-            err = lines[-1] if lines else 'Unbekannter Fehler'
+            err = r.stderr.strip() or 'Unbekannter Fehler'
+            add_log(f'Upload {name}: rclone stderr: {err[:300]}')
 
         with upload_lock:
             upload_state['results'].append({'name': name, 'ok': ok, 'msg': err})
diff --git a/version.txt b/version.txt
index 693195b..b5d7271 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.0.43
\ No newline at end of file
+1.0.44
\ No newline at end of file