put \\backup\d$\SQLBACKUPS\SLSQL\ACPW_AppE\* -neweronly -resume
If that does not help, please attach a complete log file.
Tried your suggestion and so far it's working. I will try again next week 'cause I will have more back up files that can be uploaded. Also while waiting for the response I was trying another way of uploading files and I found out that SYNCHRONIZE works like a charm also.