I did some searching and could not find anything recent.  

I just set up my P21 and hooked up an external hard drive to it.  There are certain folder with files that are showing up in the "Photos" or "Videos" folder on the PC app and mobile apps.  

How can I prevent them from showing up but still be seen in the "Files" folder? 

Or is there a way to hide these files but still have access from my mobile devices?

Thanks!