%STAFF_IMAGE_URL% is an Email Tag that can be used to populate the URL for the image that has been added to a staff profile, but that tag will only result in showing the text of a URL and not the actual image.
The actual profile image from the staff profile can be dynamically displayed in your messaging by pasting the %STAFF_IMAGE_URL% email tag into the Source field when adding an image to the email template -
While editing an email template, create a space where you’d like the picture to appear and leave your cursor on that line. Then click on the "Insert/edit image" icon from the textbox toolbar -
Enter the %STAFF_IMAGE_URL% tag into the Source field of the "Insert/edit image" window that pops up. You can also set the size of the image by adding proportions in the Dimensions boxes, which can be adjusted specifically to fit your preference -
Click on the blue Ok button to save those changes. Once you’re done editing the message body, you'll need to click on the green Save button on the template itself.
Since this template only has an email tag attached to that image and no specific staff info is yet being passed, the link will appear in the body of that template as a broken image -
Once this template gets sent out for an appointment, then the %STAFF_IMAGE_URL% tag will populate the respective staff’s profile image URL, which will cause the image to get included in the email -