If other email accounts are allowing the files to be opened, then this may be an account specific issue you'll want to contact our support to help investigate further. Since this is open discussion group, no one else in the community is going to have access to your account to investigate what is causing this.
Let us know what support finds? It's possible the account just needs to a re-sync.
CG - GoDaddy | Community Moderator 24/7 support available at x.co/247support