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The library-folder picker does open and Steam does create the directory structure; the library simply never appears in the Storage UI. That rules out the portal FileChooser for this symptom and points at the write-and-execute probe Steam runs before recording the folder in libraryfolders.vdf (ValveSoftware/steam-for-linux#8450). Document how to reproduce that probe inside Steam's FHS sandbox with steam-run, and keep library_folder_add as the route that reports a reason. The Add a Non-Steam Game dialog is a separate symptom and keeps the portal explanation. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>