"Proceed in background" has been tested with S3 protocol

Source commit: f64877fb36b5c732a6ad5117889057e6eaec07da

source/core/S3FileSystem.cpp

@@ -598,9 +598,9 @@ bool __fastcall TS3FileSystem::IsCapable(int Capability) const
     case fcRemoteCopy:
     case fcRename:
     case fcRemoteMove:
+    case fcMoveToQueue:
       return true;
 
-    case fcMoveToQueue:
     case fcPreservingTimestampUpload:
     case fcCheckingSpaceAvailable:
     case fsSkipTransfer: