Dropbox APP shows private pics I deleted off SD card...

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http://androidforums.com – So, yeah, I took some 'private' pics on my phone but decided to get rid of them. I didn't sync w/ Dropbox (the app OR on my PC). I deleted the pics in my gallery on my phone and when I use Astro to find them, they're not showing, but when I open the Dropbox app on my phone and choose to upload pics to Dropbox, the 'private' pics are still showing. I tried uploading them to see if I could just delete them off of Dropbox itself but they don't show up or upload. So, I can't figure out how the app is bringing up the pics when I can't even see them when I use a file browser app like Astr (General)