This app was working as expected. Then something changed. One copy on a older iPad now tries to GET a file when launching . Other iPad now ignores the 503 service unavailable from scanner and displays a blank document. eSCL spec is now published and available at mopria.org. “Created” is a proper response to the “POST” command but document still not available thus the “503”until image is ready. This “503” appears to be ignored by app. Also please add ADF support. I can help with this I know the eSCL spec.