Thank you Joe.
It was on a 072 firmware. The template showed and still shows "Multi-Page".
I changed it to "1 File Per Page", saved, then put it back to "Multi-Page" and saved again.
Tried another multi-page scan, and this time it went through. However, the scan was of blank pages (there's an automatic processing of files upon reception in the shared folder so I can't just send anything).
I will wait until we get proper documents to scan and send to that folder (should be today or tomorrow) and try again.
I'll post the results here.