Photos copied to Camera folder won't show up in Gallery

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http://forum.xda-developers.com – I copied about 400 photos from my G Nexus to the DCIM/Camera folder on my external SD card in my S4. The camera was already pointing to the external SD card to save photos, and any photos I take show up in the Gallery, but the ones I copied there don't show up in the Gallery. I can see the photos with Root Explorer, but I can't get those photos to show up in the Gallery. I've tried changing the settings for what photos display in the Gallery to refresh the photos displayed, but that doesn't help. Appreciate any advice...I'm stumped. Sent from my SCH-I545 using Tapatalk 2 (HowTos)