Your system information

• Steam client version (build number or date): 1687386907
• Distribution (e.g. Ubuntu): Arch Linux
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: Nvidia

1. Start steam for the 1st time
2. Log In
3. Open Settings -> Storage -> Press the "+" Symbol -> Nothing happens

Xdg-portal work on other occassions in the Steam client.