Could not create folder
New folder UI shows newFolderModal.createFailed when create fails without a more specific message.
Why this happens
Network/API error, quota/folder limits, or name conflict. 409 may show A file or folder with that name already exists here instead.
Diagnose and fix
1. Retry with a unique name; check Max folders per user if you hit a limit.
2. Confirm you are signed in and can write to the parent folder.
3. Refresh the library and try again.
4. See Folders and Folder not found.