@Robert Papel I would suggest running your GetSFTP processor while leaving the RouteOnAttribute processor stopped log enough to get a some FlowFiles queued in the connection between those processors. Then right click on that queued connection and select "list queue" from menu that appears. From the list queue UI select a few different FlowFiles and look at the values assigned to the various attributes. Does filename show as being "<some value>.csv" or just "<some value>"? If filename does not include extension, perhaps try using the IdentifyMimeType processor to see if it properly sets a "mime.type" attribute on each FlowFile which could then be used by your RouteOnAttribute processor. - Thank you, Matt - If you found this answer addressed your question, please take a moment to login in and click the "ACCEPT" link. ... View more