Reset android config

I had to re-start from scratch my server. Everything is fine now, except for autoupload from my phone. The new pictures are uploaded correctly but I’m not able to upload existing images. Is it possible my phone “know” they were already sent and didn’t trigger the upload? How I could reset config? It should be somewhere on my phone?
I already unlink/relink my account on the app. Also, I even deleted app and reinstalled, but it didn’t help.