Streaming media / vidio

Good day!
I have installed:

  1. Ubuntu 18.10
  2. nginx/1.15.5
  3. Nextcloud 15
  4. php 7.2.10-0ubuntu1

All work perfect except sreaming video on Android Nextcloud app on Samsung Galaxy S9.
If i choose Nextcloud server instead of my, streaming video in app works!
What i must do to make it work on my server?