How To Play Online Videos in MX Player 
So, lets start go to the main point how to play and watch online videos in mx player:
- At first, install MX player on android device.
- Now go to your browser (like UC browser, opera mini). Here I will show you the Via browser
- Now go to a video website and play the video on this browser. Now click Music icon (follow below screenshot).
- Now click any link.
- Now you can see mx player so select MX player and play the video on MX player.
Now enjoy the video on MX player.