Just a few days ago I purchased a 2014 MacBook Air and I set the entire thing up from a brand new install of Mojave. I am having one issue - when I open the Messages app, instead of the photos sent and received in my messages, I see a small blank white page icon with round gray circle with an "i" in it (see the attached screenshot for an example). When I click the "i" a blank box pops up that says "File Transfers". I can see the photos sent and received with no problem on my other Apple devices. When I send and receive a photo in the Messages app on the MacBook Air, the photo will appear like normal, but then when I close the messages app and reopen it, or when I shut down the computer and restart it and open the messages app again, the images are no longer there and I am shown the blank icons once again. I chatted with Apple support who suggested I restart the Mac, install a new copy of MacOS Mojave, sign out and sign back in from iCloud in Messages - and I did all of those things but with no success. I also cleared my Attachments file in Library in Finder, made sure all files in the path to the Attachments Alias were set to read and write, all with no luck. Does anyone have any suggestions? I would hate to have to wipe the machine and start all over again setting it up from scratch. Any help would be appreciated.