Re: photos deleted from file manager
Welcome to Android Central! Were the on Internal Storage or the external SD card? If they were on an SD card, unmount it (in Settings>Storage), remove it, and insert it into your computer. Then try a photo recovery program like DiskDigger, PhotoRec, or Recuva. If they were on Internal Storage, then you'd have to root the phone in order to use those programs. Your chances of recovering the photos will be low, though