Video player?
Is a video player already on its way? its the only thing that's keeping me from switching.
Others who know the app better might have a better answer for you but right now for a lot of sites I find this works well with a lot of apps.
https://github.com/SpartanJ/ImgurViewer
It's also on F-Droid!
It's already support several sites, but doesn't seem to support YouTube yet. Maybe it's related to the YouTube issue in the old Sync for Reddit right before it got killed.