according to the documentation App Inventor Extensions: File | Pura Vida Apps usually you use a relative path, which would be in your case Download/The Story Book
probably the spaces in the directory name might be a problem… I would use directory names without spaces…
Also what kind of extension is Access_File_Permission? Any link? I would use the extension by @bodymindpower from the N community here After SDK33: required storage permissions on Android 13+ (READ_MEDIA_...) missing - #12 by Taifun
Taifun