Please try downloading this free Google App to view MP4s:
https://play.google.com/store/apps/details?id=org.videolan.vlc.betav7neon
Here are some other video Google App options:
http://www.androidauthority.com/best-android-video-player-apps-526116/
How do I view videos with my Android device? - Knowledgebase / Tech Questions - Early to Rise Customer Support
How do I view videos with my Android device?
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- Last updated: Feb 20, 2020 by Stephanie H