Sorry to revive this, but I am having trouble embedding mp4 files that we host locally. They just show up as links, not as playable videos.
An example can be found here: https://archive.mpi.nl/forums/t/screencast-creating-an-account-at-the-language-archive/2750
Do you know what the issue may be? I’ve set staff authorized extensions to accept all file-types and added nl in the markdown linkify tlds.