[OT] A video on home page it isn't visible from the mobile - PaperMod theme

I set a video (.mov or .mp4) in the home page.
I tried it in local, and it worked.
After the deployment, I could not see the video (it appears only on a coloured background).
The same is about the Twitter timeline that is an HTML code as follow (I changed the twitter username with user):

<a class="twitter-timeline" data-width="600" data-height="800" data-dnt="true" href="https://twitter.com/user?ref_src=twsrc%5Etfw">Tweets by user</a> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>

Are there issues with the mobile?

The question is OT ins this forum, since this is a front-end question that has nothing to do with Hugo.

Please try asking at the Papermod Theme repo.