I want to make same functionality as tags working into a post. I want to add some custom file to be add as downloads, where i can add images/files/pdf from a URL, and it will saved as tags, we can delete the files names as tags do. I want to enter Filename in a text field, and url of file in another text field and add this information into selected fields. as per attached file.
Please check ACF https://www.advancedcustomfields.com/
Create new text field for title https://www.advancedcustomfields.com/resources/text/
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'.