Hi Daniel,
What app are you using to scan?
https://www.microsoft.com/en-us/p/windows-scan/...
Give Windows Scan a shot and see if it’ll add all the scanned pages into 1 document.
If no dice, you can use a PDF editor to merge them. If you don’t have one of those, you could use an online converter to merge all the scans into 1 - https://combinepdf.com/
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Let me know!
- C