Why documentDownloadLink does not work in modification mode ?

Question

Hi, 
 I have a process that displays a form. The latter contains an upload component and a donwload link. 
 The upload mecanism works fine as I can see the "document_id" saved in my rule Input. 
 
 Could you tell me why when the user is in modification mode of the form (not readonly) the click on the download link throws this error please? 
 {"error":"APNX-1-0000-000","message":"Invalid Content ID","title":"An error has occured"} 
 
 If I save the form, leaving the process terminating, writing the data in DB, and then re-open the form (from the same process), the download button works fine. 
 
 When I am in modification of the form in the Designer, when testing the link, I can see the error is systematic, but if I launch a testing Expression rule to examine the document ID, I can verify that the document in file system Appian is fine : 
 todocument(51755) => gives me the correct document 
 
 Any idea ? maybe is it the normal way to work ? 
 Regards

Stefan Helzle · Accepted Answer

Until the form is submitted, the document is in a temporary state. When your link points to this document, it will fail. This is default behavior.

Mike Schmitt · Answer

To be absolutely clear - It makes * no difference * that you're in edit mode. The only important consideration is that you *can't link to temporary files*, and this stays true whether you're viewing the interface editor or in a live task instance. You must only show links to files that have been moved into your normal Appian folder structure, and that only happens when the form the document was uploaded on is submitted.

Mike Schmitt · Answer

All " toDocument() " does is take an integer number and cast it into the "Document Type" wrapper. It doesn't matter whether that ID actually represents a currently-accessible document, or any document for that matter. In other words it doesn't mean much.

Why documentDownloadLink does not work in modification mode ?

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