I'm using the Finnish official Department of Transport's "digiroad" road network vector file, which has all kinds of roads, cycle paths etc on it, but I can't use Road Graph on it.
If I create a new line vector and draw some lines, I can use Road Graph on it.
I don't see how the digiroad is different, other than having several different types of roads. Why can't Road Graph utilize it (it doesn't even let me choose it)?
I'm a beginner, but I've used the same material before on arcgis.