How to delete summernote file before upload

Hello, I have been trying to implement the summernote form into a site. I checked the tutorial but I have an issue when users want to delete the image already inserted in the system.

• The goal is to only insert the image and the content only when the form is submitted; but with the insert step in the tutorial it is already uploaded, and I did not see the way to delete it yet.
  Yeah, it is deleted in the textearea but in the folder.

Thank you