Adding Custom Button to Post Type

Questions and Answers Strapi Backend
1
System Information
  • Strapi Version: 3.3.2
  • Operating System: Windows
  • Database: MongoDB
  • Node Version: 12.18.3
  • NPM Version: 12.18.3
  • Yarn Version:

I would like to add a custom button on a simple page of a specific post type. Ideally what I am trying to do its download a PDF of the data. I understand this can be done using a custom end points, I couldn’t find a documentation on extending UI of post types.

Any reference to accomplishing this ?