Welcome to Community, @savymom78. I can help you get past this error.
The stored history in your regular browser can be corrupted and can cause unexpected behavior in the program. Let's try uploading your attachments using a private browser or incognito browser. This way, we can isolate this for a possible browser-related issue. You can use any of these keyboard shortcuts:
- Google Chrome: Ctrl + Shift + N
- Mozilla Firefox: Ctrl + Shift + P
- Safari: Command + Option + P
If you're able to add your attachments successfully, you'd want to clear your regular browser's cache. Also, you can use other web browsers. You can try running the browser health checkup tool to see if your current browser is compatible with QuickBooks Online.
Just in case, I'll add these articles for future reference:
I want to make sure everything is taken care of for you, so let me know if you have any other issues or concerns by leaving a comment. I'm always happy to help. Have a great weekend!