Why not have a simple, blank template on your mobile app? I needed to send out messages following Hurricane Irma and could not delete the image in the template. How do you delete it? I only wanted to send a message cancelling events and I did not need or want any images in the message.
Thanks for reaching out to the Community with questions and feedback about creating your email! I apologize you weren't able to find the type of email template you were looking for in our mobile app. I would be more than happy to pass along your request for this type of template.
In the mean time I suggest selecting a "standard template" and picking any of the three available. You are correct these templates do come with an image block in it. However the good news is you can remove the block. You can delete them by pressing down on the image block itself and dragging it to the trash can that appears. Hope this helps!