Attachments On Reply
This plugin hides attached file(s) for guests and for members who haven't replied to the topic.
Installation:1. Upload the inc folder to your MyBB installation directory.
2. Go to your Admin-CP and click Plugins.
3. Click Install & Activate.
Update:
Upload the inc/languages folder to your MyBB installation directory and overwrite existing files.
Customization:
In your Admin-CP go to Templates & Style >> Templates >> Global Templates and edit the "postbit_attachments_hidden" template.