Uploading MP4, less than the 5.86 MB max, encoded the same as those I’ve uploaded for the last year, notifies of upload complete:
but stalls there, never renders or errors out over several minutes. Close entry form to abort.
Success as recently as this one:
/edit
Trying smaller file sizes…
MB
2.2 ok
3.7 ok
4.7 ok
5.3 ok
good enough 
Maybe a server (or user) anomaly (this morning)?
Rock on…