If the file will import directly into an existing song you will see preview controls there at the bottom of the browser, which also allows previewing it's tracks. If you are viewing a MIDI file from the browser, you can always tell in advance if the file is over or under that threshold by looking at the bottom of the browser when the file is selected. Studio One uses a threshold for MIDI files, perhaps around 50KB in size, where if a MIDI file is over that threshold it will not import in to an existing song, but instead will create a new song. Why does Studio One sometimes create a new song when I drag in a MIDI file from the browser?
This article addresses some of the more commonly asked questions related to MIDI in Studio One.
