We have a situation, where user upload a document, after he hits a upload button on screen1 in back end a PDF Converter will gets triggered. until the uploaded doc got converted user will be seeing a screen2, where he has a refresh button, up on hitting this button we will be looping back to this same screen2 until PDF conversion is done. now they want to remove this button and want system to display screen2 with no buttons and once the conversion is done user should land on screen1 to upload more doc
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Can you just have the original task submit, and chain the user through the PDF document generation, so that when they reach the next task the generation is complete? It sounds like your customer is OK with this taking a few moments to complete (you can also use confirmation pop-ups on your buttons to make sure the users know it'll take a minute).
At this moment Appian has no official method for "auto submitting" a form. The best techniques I've seen are either using a looping refresh button (like what you're already doing), or providing a "dismiss" button for the user to close that task and then the next one will appear on their task list when the generation is completed. Obviously neither of these is as automatic as what they're asking for, but those are the constraints we work with.