Avi files download to surface pro tablet instead of play

I have avi files stored on the mycloud and connected to my home wireless network. Using my tablet connected to WIFI, when i try and play the video file, it downloads to the tablet instead of playing the file. How can I get it to simply start playing the video? It used to just play right away but after upgrading to win10 it won’t anymore. I went back to 8.1 but still won’t just play. There must be some sort of setting that I can’t find. Thanks for any help.

On your local network I’d recommend mapping the share with your data for direct playback instead of using the app.

How to map a My Cloud or NAS device on a Windows PC