Hi, I'm using Android on a Samsung Galaxy S3 mini and I'm unable to change my lock screen to a custom picture recently. Whenever I choose a file on my phone it says that it's cropping the file and returns me to the main screen but the picture doesnt get applied. However if I try to select a preset wallpaper from the phone it works. This is only a recent problem as I was able to change my lock screen with custom pics some weeks ago but now it doesn't let me anymore. I've already performed a system restart but it didn't help either.