Sorry for the trouble! Usually mimoLive should be able to play back mp4 files. Please can you send us a sample movie file which didn’t work for you to support@boinx.com ?
All of my different 9:16 mp4 video did stop play in preview. I downloaded it from pinterest.com site, didnt convert.
Also you can see at screenshot, that file size shown as 0x0, but size shown in sources is normal
Earlier i uploaded mp4 with “ocean waves”, need one more?