Hey @greenwellmfg,
Are you having the same problem with QuickBooks Desktop, or QuickBooks Online.
If it's the prior, I would do the following:
1. Make sure your software is up to date.
2. Try adding an attachment again.
3. If that still doesn't work, Backup your system file so you always have a save point. Then, download File Doctor and let it do a diagnostic of your software. This should automatically correct most problems.
Let us know if that does the trick.
