I am trying to pass the document from interface to process model but in process model I am getting blank value in PV.
Steps:
1. uploading document from file upload.
2. On click of submit button try to send the selected doc to process model
3. Process variable is blank even after sending the doc from interface.
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You cannot "send" a document to a process. In Appian, documents a only uploaded on a submit action. With the exception of portals.
Make that interface the start form of a process, set the submit parameter on the button to true, and you will find your document in the process.