Enter a folder name
Create folder rejected an empty name (folderNameRequired / modal required copy).
Why this happens
Submit without typing a name. Distinct from character/length rule errors.
Diagnose and fix
1. Enter a name using allowed characters (see letter/number rule article).
2. Stay within max length (Folder name must be at most {max} characters).
3. Retry create.
4. See Could not create folder for generic API failures.