Users can not upload files and user management acts strange on rootles podman setup

[quiet-inventor]

I set opencloud up with podman quadlets in a rootles setup with caddy as a reverse proxy. At the first glance everything worked fine, when I logged in as admin, but then I tried to add another user. The added user was not directly shown in the list of users, it was only visible when I filtered for role type "user". Also, changes to the user are not possible or not reflected by the UI. Later, the user was always visible. When I log in as that user, I can not upload files or create folders. What is even stranger is that the data of the admin account is displayed in the top right, when I use the credentials of the user to login. I use the built-in user management.

View of the admin account:

View of the user account:

This is the quadlet I am using:

[Container]
Image=docker.io/opencloudeu/opencloud-rolling:3
AutoUpdate=registry
User=0
Network=opencloud.network
NetworkAlias=opencloud

Entrypoint=["/bin/sh"]
Exec=-c 'opencloud init || true; opencloud server'

#environment
# enable services that are not started automatically
Environment=OC_ADD_RUN_SERVICES=
Environment=OC_URL=https://cloud.internal
Environment=OC_LOG_LEVEL=info
Environment=OC_LOG_COLOR=false
Environment=OC_LOG_PRETTY=false
# do not use SSL between the reverse proxy and OpenCloud
Environment=PROXY_TLS=false
# INSECURE: needed if OpenCloud / reverse proxy is using self generated certificates
Environment=OC_INSECURE=true
# basic auth (not recommended, but needed for eg. WebDav clients that do not support OpenID Connect)
Environment=PROXY_ENABLE_BASIC_AUTH=false
# demo users
Environment=IDM_CREATE_DEMO_USERS=false
# admin password
Environment=IDM_ADMIN_PASSWORD=admin
# email server (if configured)
Environment=NOTIFICATIONS_SMTP_HOST=
Environment=NOTIFICATIONS_SMTP_PORT=
Environment=NOTIFICATIONS_SMTP_SENDER=<notifications@cloud.internal>
Environment=NOTIFICATIONS_SMTP_USERNAME=
Environment=NOTIFICATIONS_SMTP_PASSWORD=
Environment=NOTIFICATIONS_SMTP_INSECURE=
Environment=NOTIFICATIONS_SMTP_AUTHENTICATION=
Environment=NOTIFICATIONS_SMTP_ENCRYPTION=none
Environment=FRONTEND_ARCHIVER_MAX_SIZE=10000000000
Environment=PROXY_CSP_CONFIG_FILE_LOCATION=/etc/opencloud/csp.yaml
# enable to allow using the banned passwords list
Environment=OC_PASSWORD_POLICY_BANNED_PASSWORDS_LIST=banned-password-list.txt
# control the password enforcement and policy for public shares
Environment=OC_SHARING_PUBLIC_SHARE_MUST_HAVE_PASSWORD=true
Environment=OC_SHARING_PUBLIC_WRITEABLE_SHARE_MUST_HAVE_PASSWORD=true
Environment=OC_PASSWORD_POLICY_DISABLED=false
Environment=OC_PASSWORD_POLICY_MIN_CHARACTERS=8
Environment=OC_PASSWORD_POLICY_MIN_LOWERCASE_CHARACTERS=1
Environment=OC_PASSWORD_POLICY_MIN_UPPERCASE_CHARACTERS=1
Environment=OC_PASSWORD_POLICY_MIN_DIGITS=1
Environment=OC_PASSWORD_POLICY_MIN_SPECIAL_CHARACTERS=1

Volume=%h/opencloud/config:/etc/opencloud:z
Volume=%h/opencloud/data:/var/lib/opencloud:Z
Volume=%h/.config/containers/systemd/opencloud/config/csp.yaml:/etc/opencloud/csp.yaml:z
Volume=%h/.config/containers/systemd/opencloud/config/banned-password-list.txt:/etc/opencloud/banned-password-list.txt:z

[Service]
Restart=always
RestartSec=5

[Install]
WantedBy=services.target

Does anyone here had a similar issue or an idea what might be the problem?