When you create a template, on the bottom of that message you will see a bar that adds IMAGE TEMPLATES. Once you click on it, you will have several TEMPLATES to choose from.
In the screenshot below, I opened blank document, just to demonstrate where the LOGO button is and you can see how it looks like.

On the right side of your editor - you will be able to see the option for adding a logo.
You can always add logo on the existing picture as well.
It will automatically pick up the logo of the person based on his or her email address.
📸🥳
We also made a short video on this:
In the screenshot below, I opened blank document, just to demonstrate where the LOGO button is and you can see how it looks like.
On the right side of your editor - you will be able to see the option for adding a logo.
You can always add logo on the existing picture as well.
It will automatically pick up the logo of the person based on his or her email address.
📸🥳
We also made a short video on this:
Published on: 21 / 10 / 2019