Poor mp4 playback on iOS15

Have you searched the Docs and Knowledge base? Yes
Principle Version: 6.11
macOS Version: iOS 15.1
Description of what you need help with:
I sent out a few share version to web prototypes with .mp4 files (no transparency). We notice they were working buttery smooth on ipads running ios14 but for ios15 the movie would take forever to load and have poor, stuttering playback.
Steps to reproduce the behavior:

  1. place any .mp4
  2. share to web
  3. playback on ios15 device

.prd file link (we really need this to fix almost any problem):

could you email the share link that is playing back poorly to support@principleformac.com and I’ll look into it.