Thanks for getting in touch with us today, fence,
Let me help you get this sorted out.
May I know if this is happening across all the web browsers? If not, we can try downloading your attachments in a private browser. Doing this does not save your browsing history making it a good place to isolate web data issues.
Here's how to switch to a private browser:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Internet Explorer: press Ctrl + Shift + P
Safari: press Command + Shift + N
If you're not getting the same result in the incognito window, you can go back to regular browsing and clear your browser's cache. However, if the issue persists, you can try uploading the attachments in lesser batch intervals.
Please fill me in with the outcome, fence. I'm here to help you whenever you needed me.