ng-flow running from AngularJS service?

[johnjvester]

I was wondering if ng-flow could function from a service within AngularJS 1.5? Has anyone documented this pattern somewhere, like JSFiddle?

The idea is to allow users to submit a large file to upload, then pass the upload to the service, so that the end user could do other things on the AngularJS site ... across various other controllers ... while the upload continues.

I have been making progress figuring this out on my own, but wanted to see if there are any known limitations that will cause this not to work as I described (briefly) above.