[Bug] Auto upload with multiple accounts is not working

Steps to reproduce

1. enable "auto upload" for 1 (private) account (leave the 2nd (work) account as it is)
2. take a picture, while the 1st (private) account is selected in the app
3. picture is uploaded to the 1st (private) account
4. switch to the 2nd (work) account
5. take a picture
6. the iOS app tries to upload it to the 1st (private) account but uses the credentials of the 2nd (work) account
7. picture remains on phone, 1st (private) account gets blocked (fail2ban), because there were too many wrong logins

Expected behaviour

use the credentials of the 1st (private) account where the "auto upload" is enabled and sync with this 1st (private) account

Actual behaviour

user of the 1st (private) account is blocked (fail2ban) and pictures are not synced.

Reasoning or why should it be changed/implemented?

Photo sync cannot be used if you have multiple accounts

Environment data

iOS version: iOS 16.5.1

Nextcloud iOS app version: 4.8.5.1

Server operating system: Debian 11

Web server: nginx

Database: mysql

PHP version: 8.2

Nextcloud version: 27

Reproduce the issue using the listed two-account auto-upload steps on the iOS app, then trace how the selected account and auto-upload account credentials are chosen. Done means a photo uploads to the account with auto upload enabled without using the other account's credentials or triggering an account lockout.