Hi there, thanks for bringing up your issue with videos not resuming. I'll do my best to help.
Now, just to be on the safe side, is the "Pick up playback from where you left off" option enabled in your app? It's located in the app's Settings > Video Player. If it is but you're still having this issue, could you share with me the device you're using, the connection type (app from Meta, Steam, browser) and the app version?
Once I have that, I'll be able to take a closer look. Thanks!