Why are creepy things poping up in my gallery?

[Xaly 26]

Hi. So for the last few weeks or so, I have had photos and videos of things I have never seen popping up on my gallery making folders for themselves and titling them like "water mark" and the photos are things of like purple spikes, citys and explosions! And my videos,are being put into folders named "local videos" and adds I have watched are being added to my gallery. What do I do is someone watching my videos?

 

[B. Diddy]

Welcome to Android Central! They're likely photos and videos being cached by some other app you installed, or an ad service associated with an app. That media will show up in the Gallery if the developer forgot to add a file called ".nomedia" in the directory where the files are located. .nomedia instructs the system to ignore that directory when scanning for images to add to the gallery database, and developers are supposed to know to add that file, but not all of them do.