@misssweetcherrie and @strpyw Actually you don't need to download any player excepted the built-in player does not play or not compatible. For Ubox or any Android box, go to the File Manager and select USB then select the movie file that you want to play, it will ask which player you want to use with, select any and click use once first see if it work, if the player it works then use it on next time for always use. If all the players were not play then download vlc player by plug in the USB open it on file manager select usb and select the app to install.
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and use mxplayer or vlc player to play the video.