Hello usually on most servers you can not pull php script into a normal html file. It would need to be a php file or a phtml file by default. The ability to parse php code in html code is setup in the server config and unless you have ability to do this you are confined by the server parameters.
You can change your html code to a php file much like out templates surrounding your html page like so in bold and placing an include in the file and echo the photo contents. You would then rename the file from index.html to index.php
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