Settings
To enable Attachments in WordPress comment, go to rtMedia > Settings > WordPress and switch on the Enable attachments in comment button.

- By enabling this option logged in users are allow to attach media in wordpress comment.
- This option allow non-logged in users also to attach media in wordpress comment.
- This option provides control how to display uploaded media in comment.
Features
You can attach files to WordPress comments. 
The result is shown below:

Notes: rtMedia WordPress Comment Attachment in WordPress comments uses `medium` as the default photo size.