If one try uploading a larger attachment (several MBs) it gets the following error:
Upload Failure
recording_20170111_013125.mp4
Exception: No configured storage engine can store this file. See "Configuring File Storage" in the documentation for information on configuring storage engines.
The expected error message would be along the lines of file too large, file size limit is $1
It would be useful to add the size limit to the upload dialog as well.