Don't know if it will occur every time, but for this one you'll need to ask MR cust svc to manually post the incidentals for the stay & provide the incidentals folio.
It might also be an int'l vs. North America issue. We've had reports of prepaid rates not even generating points for the room rate int'ly, & it being suggested that someone spend something on incidentals (even if small amount) to trigger a folio at all.
Moving forward it certainly can't hurt to ask a property to prepare a folio that shows room charge, that you pre-paid (they might have to list it as deposit), & the incidentals. Not sure they'll all do it but can't hurt to ask.
Cheers.