Adding a .nomedia file to a folder is an old school hack that keeps files from say a game folder showing up in video and music playing apps. Do you really want cut scenes from say Doom showing up in your video player? It's a good thing that goes back to the PALM/PocketPC days of personal digital assistants (PDAs).
That's one thing that I've noticed: some files that I have moved from the phone's internal storage to SD get moved back and then I have to move them again. This seems to be especially true of items in the Android file.
I use a .nomedia file for, example, folders and photos that I don't want showing up in my Gallery. And to head off your suspicions, post-surgery progress photos.
(But I like the way you think)
A .nomedia file is simply an empty text file. A simple file opened in Notepad, for example, with absolutely nothing written... save it as ".nomedia.txt" and NOTE the dot on the beginning! That dot puts it at the very top of the folder... when Gallery scans internal memory (and/or microSD card) for photos and videos, Android knows that ".nomedia" is your instruction to Gallery to SKIP that folder. It can be copied and used in as many folders as you need... and since it's a blank text file, it's really small.
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