@amtar You can enable regular file uploads, but this would not show the uploaded file in an embedded media player.
Out of the box we do not automatically embed video files.
When I am uploading avatar, I got message " spawn convert ENOPEN";
when I check it with "./nodebb log" the error message is shown:
BTW, the nodebb version is 0.70 and installed on a Mac , the "/public/uploads" path permission is ok for write
And it seems it means the file size is too huge, that NodeBB (probably) can't read and gives this error.
the size is less 10K