Hi, have been experiencing a "Unable to open document" in dimensions 3.4.4.
There has been some discussion about this issue but I could not locate any real solutions so I contacted email@example.com on the 23rd October but have not received a reply.
I did some tests and seem to have found an easy solution.
Drag the file(s) you cannot open out of the CC folder and back again. They now open.
Just wait a while between dragging them out and back.
For anyone experiencing this issue I hope this solution works for you.
Thank you for reporting an issue and the solution.