diff --git a/app/pipeline/file_manager.py b/app/pipeline/file_manager.py
index 9524b4a..c483575 100644
--- a/app/pipeline/file_manager.py
+++ b/app/pipeline/file_manager.py
@@ -401,9 +401,43 @@ def _next_available_samba_target(dir_path: str, file_name: str, samba_conn) -> s
 
 
 def _samba_move_file(path_from: str, path_to: str, samba_conn) -> None:
-    with samba_conn:
-        samba_conn.copy(path_from=path_from, path_to=path_to, replace=False)
-        samba_conn.delete(path_from)
+    try:
+        with samba_conn:
+            samba_conn.copy(path_from=path_from, path_to=path_to, replace=False)
+    except Exception as exc:  # noqa: BLE001
+        raise RuntimeError(
+            "SMB move failed at copy stage: "
+            f"source='{path_from}', target='{path_to}', "
+            f"{_format_smb_exception(exc)}"
+        ) from exc
+
+    try:
+        with samba_conn:
+            samba_conn.delete(path_from)
+    except Exception as exc:  # noqa: BLE001
+        target_exists = _safe_path_exists(path_to, samba_conn)
+        raise RuntimeError(
+            "SMB move failed at delete stage after successful copy: "
+            f"source='{path_from}', target='{path_to}', "
+            f"target_exists={target_exists}, {_format_smb_exception(exc)}"
+        ) from exc
+
+
+def _safe_path_exists(path: str, samba_conn) -> bool:
+    try:
+        with samba_conn:
+            return samba_conn.path_exists(path)
+    except Exception:  # noqa: BLE001
+        return False
+
+
+def _format_smb_exception(exc: Exception) -> str:
+    details = [f"error_type={type(exc).__name__}", f"error={exc}"]
+    for attr_name in ("ntstatus", "status", "winerror", "errno"):
+        value = getattr(exc, attr_name, None)
+        if value is not None:
+            details.append(f"{attr_name}={value}")
+    return ", ".join(details)
 
 
 def _write_probe_file(remote_path: str, samba_conn) -> None: