I've been using the automatic photo backup for a long time now, and I assumed it is reliable and all my photos are being backed up successfully when it says they are. I am really alarmed to discover that is actually not the case. Recently I opened Dropbox and it started the photo sync and it said it had a little over 2200 photos to sync, ok no problem I left it open and let it do its thing. I checked on it a few minutes later and it said "all backed up" and I think wow that was really fast...too fast actually. So I check my dropbox and there's only 561 files there. It missed like 1600 pictures and said "all good!". This is really alarming and I'm now instantly extremely sad thinking about how many photos my wife and I have likely lost over the years. I am shook. How can I get it to retry all the photos it apparently did not upload?