Videos not playing on mobile breakpoints

Hello - I have uploaded video clips to my site, but they do not play in mobile breakpoints. I have tried re-uploading but have not had different results. I am curious if there is a solution here that I am missing. Any assistance is appreciated!

Share link:

**Go to the 1440 Case Study page and scroll down to the video clips. You should see that they play in breakpoints upward of 992, but not tablet, mobile landscape, mobile portrait.

They will probably play just fine on published site.