The Images section of the following document
https://developers.google.com/apps-script/html_service
says that only images hosted on a public url can be displaye
It sounds like you're trying to offer some sort of permalink from Google Drive that is publicly accessible.
Open the File.
Under the File Menu, Click Sharing.
Under "Who has access", click Change.
Select "Public on the web".
Click done, and copy the link listed. That is your publicly available link which should work for you.