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How to download a PDF with sendFile

We're using an assignment and flow action to collect config options for downloading a PDF file. On submit, the flow action goes into an activity to display the file using sendFile and returns to the assignment to allow the user to repeat the operation. The activity displays the file with sendFile which works well. The issue is that the original submission never gets a response so when we return to the assignment, the wait cursor is displayed until the request times out.

Has anyone gotten sendFile to work with flow processing so that submissions terminate normally?

Thanks.

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