Same problem here as well.
Opened a ticket for it in here back in December, see link Duplicat uploads from iOS client
But no solution or any more comment to this latest months
It is a big problem for me, and I do think I need to look for another service since this “ruin” my experience with in any other way a really good piece of software
My findings is that it happens if you look through the pictures on your phone. Then it will upload the same pictures again
I suspect it is because it will identify the picture to upload on the “last modified date” instead of the original created date… but not sure.
Hope that someone could come up with a solution for this in not too long. Can’t believe that not more people face same problem
I have tried two different server installs now, three different users and three different mobile phones… same on all…
Br Eivind