Right now, we do not send notifications to admins when there is a content waiting for approval in Admin Panel> Moderation section. 

 🚗 We have this feature on our roadmap :) 

You can add images to all content types. However, the "Post" content type is the one that accepts image gallery. You can learn more about the difference between the content types available in Tribe, here5. 

Yes! We have released a feature called "Social Share" that allows you to share invite links. You can learn more here6. 

Once you add a Soundcloud URL to your post it will turn it into a widget.