I have a new tenant that recently uploaded a lot of .avi videos to various jobs from the office side. The files seemed to have uploaded and saved and so the tenant deleted a bunch of these files off of their PC. They then went to view the files at a later date and realized that .avi could not playback in the system. I think it would be very beneficial to have an error message prompt upon attempting to add incompatible file types that stated something to the effect of "this attachment file type is not compatible."
And or, provide a tool tip next to the attach file icon that states the compatible file types.
Also had the same issue come up with a different tenant. Would reduce a lot of cases into the support and customer time spent trying to troubleshoot on their own if only compatible file types were able to be attached or at least showed a list of compatible files.