Trummi is still growing and new features are on the way. At the moment, photos cannot be sent in messages.
We believe the world would be a better place if users didn't have access to this small piece of information. There's no plan to add read receipts at this time.
Individual messages cannot be deleted. However, you can delete the entire conversation to remove all messages with a user.
To delete a conversation:
No. Deleted messages are permanently removed and can't be recovered.
No. At the moment that feature is not available.