The app is essentially a YouTube player.
It plays YouTube videos using the YouTube embedded player.

Functionality:
- Enables the playback of YouTube videos within the app
- Locally keeps a record of your viewing history
- Note: Some YouTube videos may have restrictions that prevent playback in embedded players.
  The app respects these limitations and will not be able to play such content.
- To use PiP, switch to full-screen mode in the video player, then swipe up to go to the Home Screen

This app does not offer many functionalities besides playing YouTube videos.
It might be better to find a YouTube video elsewhere and then paste the link into the app.