If you click "Bookmarks" -> "Add Bookmarks" for the first time then there are no folders entered.

Clicking "Ok" will not result in any bookmarks being saved.

Only if the user creates a new folder and assigns it to the Bookmark then the Bookmark appears in the menu.

For this task:

• Either disable the Ok button until a folder has been created and selected.
• Or make a suggestion that is better in terms of usability and implement it once it's agreed on.