Motorola Moto G 4G — media apps and adm stopped showing when play videos on android apps after updating a movie app from unknown sources.

media apps and adm stopped showing when play videos on android apps after updating a movie app from unknown sources.when i now play a video only three of my players show up , all others are disappeared .i used to play a video on uc browser and after chosing play with external players , i used to chose adm and easily download videos, now adm doesn't show up.i heard that it is a marshmallow bug.now how can i get my players back,dont tell me hard reset.thats a lot of work.