There are several file managers on the store that have permissions to access the photo library and use data services. I don't trust all that software so I would like to know if it's possible that a software with this permission uploads fotos, or music when the permission is given, to somewhere on the internet without my knowledge?
I suppose it would be possible. Read reviews on the app before you download for any issues others may have found. Also, if an app with the same capabilities is made by a well-known developer, it is generally "safer" to download that app, if you are worried. Finally, you could use Data Sense to see if the app is consuming more data than seems necessary.
There are several apps that try to automatically upload your photos:
- OneDrive: currently tries to catch you with an additional 15GB if you allow it to upload your photos and videos
- BitTorrent Sync: As an option, has to be switched on
- Dropbox: As an option, has to be switched on
Probably other files-in-the-cloud-apps will also have such features.