The FileExporter/FileImporter extensions import files from local wikis to Wikimedia Commons. After the import, the local community can decide to delete the original local file.
But after deletion on the local wiki, it might turn out that the file needs to be deleted on Commons. That could happen because some US copyright details are tricky (which is why in some communities, human user triple check any file before moving it to Commons).
The wish is for a comfortable way to restore local files when an imported file was deleted on Commons.
Where this issue/wish was mentioned: