How to add custom post widgets as tags into wordpress

by

  1. Please check ACF https://www.advancedcustomfields.com/

  2. Create new text field for title https://www.advancedcustomfields.com/resources/text/

  3. Create new file or text field for file https://www.advancedcustomfields.com/resources/file/

You can also check link field https://www.advancedcustomfields.com/resources/link/

Adding fields to Posts
When you add new field group you can set position to ‘Side’.