Automatically delete a photo from phone, after it's been uploaded to Dropbox via camera uploads.

Could be! I've never deliberately installed or uninstalled anything (and I don't use the Dropbox phone app) -- all I know is that when I plug my phone into my desktop, it used to do this and now it does not. May be a changed feature on either or my phone or my desktop, but since I never set it up I don't know.