The Modeler and file polls

We have many integrations that begin as a file poll. In 6.x the file poll is set up as a type of port, designating which service is the recipient of the poll.

It seems as though I cannot also make this service the first step in a process within the Modeler, as the service does not have a “subscription”. If I try to generate the business model it will fail.

Either this seems to be a major deficiency of the Modeler, or I am doing something wrong. Which is it and thus how are you “modeling” file polls?