To add images or logos to your messages, navigate to the Custom Messages page, select the message you would like to edit, and from the text editor, click on the “portrait icon” in the toolbar above the text editor content box.
From here, you can either directly upload an image from your computer, or upload an image from a URL.
After uploading your image, you can edit the image accordingly. You can change the size of your image by clicking and dragging the corners of the image. This will make sure your image resizes proportionately. You can also manually adjust the size of your image by clicking on the "Change Size" button and add in the desired pixel size (please keep in mind this could distort your image).
To center your image or logo, highlight the image as shown in the screenshot below:
Once the image has been highlighted, click the center alignment option from the main text toolbar. To add a hyperlink to your message, you can click on the image and select the "link" icon from the resulting menu. Learn more here! You can now continue editing your message or click "Continue" and "Done" to save your changes.