Re: why my gs4 says "insert sd card" and now some of my pics are gone
Sounds like the card is bad. Use a card reader plugged into your PC (with the card plugged into the card reader). Download
PhotoRec. Burn it to a disk. Boot the computer from the disk. Tell PhotoRec to recover from the card to the hard drive. If there's anything on the card, PhotoRec will recover it.
(If it's a SanDisk card, you can contact their live support at
SanDisk microSD Tech Support. [Their cards have a 5 year warranty.] Otherwise, you may or may not get any support.)
Autobackup backs up both directions, so if a picture disappears from the phone, it gets deleted from the backup. Back up manually. Just make sure that you
do back up.