Apple Event: May 7th at 7 am PT
Since my upgrade to High Sierra, I can't download, read, quicklook ..... almost any attachments.
Especially PDF documents are problematic. It shows a light blue sign "Dowloading" under the file icon.
MacBook Pro (15-inch Mid 2012), macOS High Sierra (10.13)
I have this issue also. I have tried all the suggestions above, but I cannot open some attachments they are stuck downloading. Not all attachments have this issue. Just from certain people sending them. PDF Documents Jpgs from particular clients are all stuck not downloading. If I ask my client to send the attachments to my gmail account, I can then go to Gmail through my browser to download the attachments. I have tried going to mail on iCloud.com through the browser, but they are not downloading from there either. All started happening after upgrading to high sierra and iOS11. I have an iPad still on iOS10, but the same emails with attachments are still stuck.
Switching Downloading Attachments to None in Mail preferences seems to work. Go figure. I'm using Mojave. Had same problem after upgrading from ElCapitan.
Then you do not get the attachments in any mail. What is the point?
remove the account and add it back it will resolve the issue
It didn't help me when I tried. The attachments that I manually download they are infected. So it hasn't with the account to do.
This does not work for me.
This has been going on for some time, and it appears Apple has no intention of fixing. Not the actions of a company that intends to stay in business.
Mail 11 (High Sierra): mail attachments "downloading" but never actually download
