Get CRM image download URL

Get CRM image download URL

I am trying to get an image uploaded to a CRM module to attach to a Writer merge field. I had it working at one point, but it stopped. 

I have used a basic image upload field, file upload field, and the attachments section of the module. I can get the ID for the image, but I am unable to use the ID to find or generate a download URL to pass to Writer. 

If anyone has some experience doing this, I would greatly appreciate your help. I appreciate any help you can provide.