If you're inside Probe (the sample editor), use the menu "File > Export > ..." and one of the file options. If you're in Studio, you can use "Project > Sample Upload > Bounce Timeline", which will send your bounce to Probe.
unfortunately what I just described will probably never be added, because it seems like a workaround for the "export mixdown" feature patreon supporters get.
bounce timeline > sample in probe > export the sample. For some reason, Probe, after holding a bounced timeline, doesn't allow users to export to wav. You can do this when using the probe directly, when editing a sample you uploaded into probe from your computer.
If you're inside Probe (the sample editor), use the menu "File > Export > ..." and one of the file options. If you're in Studio, you can use "Project > Sample Upload > Bounce Timeline", which will send your bounce to Probe.