Cannot upload Snapshot file in order to import

Trying to upload a Snapshot to the following folder and it fails and retries over and over.

Using FileZilla. FTP connection is good. Can upload to other folders OK. Have had 3 lengthy calls with the web host, permissions are all good, 755, they cannot figure it out.

Can I upload a Snapshot zip file to somewhere else and still import it? Or could you help find a reason why this won’t upload?