Iphone 11 and Nextcloud, no picture upload


I reset my Nextcloud app and remove it, then I reinstall the app with the Apple Store. I setup my Nextcloud 28.0.4 Account successful. Then I go to "Options (“Einstellungen” in German) → Automatic upload (Automatisches Hochladen) → accept full access, enable “Autamic upload from pictures/movies”
Then I change the path to a existing folder /SofortUpload, there are folders from 2021, 2022, 2023 and 2024 with months 01 - 12. After I aktivate “use subfolders” and, very important: “upload complete cameracache”, the client uploads files. But after some minutes, he does not upload anymore. I have no idea whats wrong. I remove the nextcloud client around 5 times and start everytime new. One Time, I use a new and empty folder for upload, I think he upload more files. But is there no way to use the old folder with the existing files? To synchronise the new (and old, from the last days) pictures to the existing folder?

Ios 17.4