Steam cannot create new library folders or recognise the already present one

[Fake Princess]

ISSUE
Steam cannot create new library folders or recognise the already present ones.

OS
Windows 10 (x64)

STEPS
Open STEAM SETTINGS
Select STORAGE
Select + icon to add another library, or select "Add Drive" from the top drop-down list if participating in Steam Beta.
Select "Let me choose another location" option and press ADD.
Select a non-root folder in a drive other than Steam installation.

RESULTS
If on the release build of Steam, nothing happens, not even an error message.
If on the Steam Beta, it only returns the error message "#ContentManagement_Error_".

EXPECTED
Steam should create a new library folder at the desired custom location or recognise an already present library folder.

[Fake Princess]

Silly thing is, if you directly choose a drive from the list to create a new library folder it directly creates the new folder at the root, e.g "D:\", but if you try to select the folder by hand it instead gives the error "Steam library folder can't be the drive root" and doesn't let you.

[Chouhartem]

I now encountered the same issue on the release build on Archlinux which has performed an automatic update today.

Basically I have my second drive mounted over /data (where I don't have the permissions to write as a user) and inside is a folder with my username that is symlinked in my home directory with permissions for me to write into. Inside this directory there is a “Steam” folder that has been created a long time ago that contains all my games.

Then today I realised that none of my games appears to be installed. I thus checked the storage part of the settings and the drive doesn't appear there.

I hence performed the same steps as the author, however I got a blank selection window and the error appears in the setting window as per the following screenshots:
- The empty selection window: https://img.epheme.re/steam/blank_selection.png
- Add a new steam library folder: https://img.epheme.re/steam/contentmanagement_error_.png

I preferably don't want to mess with my folder hierarchy or the permission at a drive-level if possible, I know that I can just move my steam folder in /data and wait for the sync to be done thanks to the index file at the root of the directory.

[pungentstentch]

Same issue here on Archlinux, release or beta, can't add libraries.

Empty browser and "#ContentManagement_Error_"

[pungentstentch]

Answering myself I found the solution checking steam linux beta github

https://github.com/ValveSoftware/steam-for-linux/issues/9944

Just have to install xdg-desktop-portal

[Torso]

Also on Linux (NixOS). Just fixed the problem by creating a symlink between my current library folder and the new library folder steam creates.

[AQQABALAH ASPYRANT]

"Steam cannot create new library folders or recognise the already present one." Sometimes it works for me, then another day library's gone.