Go to your panel on OTT player site:
https://ottplayer.es/playlist/original
Click to 1. red marked area and select your playlist on the disk or paste your line
Give any name to your playlist on 2. red marked area.
Confirm OK (3. red marked area) Now, your playlist has been uploaded. When you connect your device with to OTT player, you need to bind your playlist.
Ottplayer example stream play:
