I find a good way to prevent uploading duplicates yourself when working through a backlog of pictures is to open up the calendar page for the day you’re working on to see what you’ve already uploaded for that day. I imported a bunch of stuff from Flickr and that’s even better because it will automatically warn you if the picture you are about to import is already associated with an existing observation. I wished that feature would exist for regular uploads as well - there’s a feature request for that.
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