agregd

I personally think this is a combination of iCloud web version vs on the Mac. I haven’t had a problem since abs I was able to recover my file from web version of iCloud

Downloading from the web version of the cloud worked. Thanks, never thought of that

I have the same issue, in Affinity Designer. I updated to 1.9, changed the file name in iCloud and now neither the one open on my iMac and the iCloud version will allow it to be opened.I rebooted the computer and didn't make a difference. I also attempted to copy from iCloud to the desktop and it produces the same error. Now it seems I have lost my work, at least it issuing hold hostage. NOTE: previous Affinity Designer Documents seem to open just fine. See screenshot images

I have this same issue, did you ever get this resolved? If so, can you share how it resolved? I cannot locate AF Designer on the Mac in High Sierra