Post not inserted

Hello,

Can you please how to debug the problem as there is no new post inserted when I type a post that is not already inserted in a Relationship field .
(it is a custom post type)

It should be added automatically when update the main post or is there a kind of add new button I do not see ?

Thank you very much,

https://ww.wp.xz.cn/plugins/acf-add-posts-via-relationship-interface/