Use Case:
I have existing images in my “Files” related list on my object and would like to merge this image field onto my google doc template however the images are not merging. What do I need to do?

We suggest to upload the image to your ‘Documents’ tab and make it externally available per this article¬†(see other options listed for merging images into template).
When we tested to upload a URL link from Salesforce Files, Salesforce does not recognize this as a direct link to image and image does not load. Salesforce Files is doing something to the URL so that is doesn’t read as a real public URL of the file and¬†restricts how our app can access this file/photo link.