Admin: All Videos not streamable
 

I noticed this question has been asked a couple times, but no responses except confirmation of the problem.

Videos on mobile devices are not streamable, instead a prompt pops up to download them. When you click the link to play, it just goes to the information page for the uploader.

Can some guidance be provided please? It is only this site that does it for me. I have checked my auto play settings, all good.