Crash when trying to send photo / sending a file did not work at all
Jami crashed when trying to send an image from Photos (iOS 13.4.1). After reopening it said "Failed to send" superimposed on the blurred-out image.
Sending files (in my case a screenshot png selected from the iCloud Drive) didn't work, not even a crash or a "failed to send" notice. I tried it with the macOS client, and that worked without a problem.