Missing data after transfer form 12 mini to iPhone 16.

90% of the data was transferred ok. 2 email addresses were transferred with no issues. On the third the additional mail boxes and ther contents were not transferred. Inbox was ok but no sent, trash drafts or and other mail boxes were transferred. I have 3 other devices with same account and everything is there.

Can you download that data from icloud - not the whole phone?