Embeds not working on mobile

Embeds (YouTube, Vimeo, Google Docs) work fine on my site for the desktop version, but don’t work on mobile. It doesn’t seem to be tied to the responsiveness of the site, as the embeds still work on the desktop browser even after collapsing the browser width to its smallest size. Anyone have any ideas of what could be going on?

Here’s an example: https://thetrek.co/appalachian-trail/a-video-montage-of-my-2016-appalachian-trail-thru-hike/