TeleFlow does not currently support http post. The "Load Web Document" step does exactly what its name suggests: it loads a document from a web source, ie: does an http get.
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<br>If the ability to post is critical to your application, you can request a customization to TeleFlow through our sales department:
sales@engenic.com or 1-888-ENGENIC (1-888-346-3462).
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<br>Aside from that, a possible work around could be to copy the file to a UNC path, or run an external program using the "Run Program" step.