Scanned document does not appear in email

I am trying to scan a document into an email on my iPhone (IOS 15.1, iPhone SE), but it hardly ever works.

I have followed the isntructions at: https://support.apple.com/guide/iphone/add-attachments-iph8580f163b/ios

I start writing the email by adding addressees, the subject line and some text. Then I click on the scan document icon. The scanning app appears, the click sound is hear and the document appears to have scanned. I press Save. The email app reappears, but there is no scanned document in the email. Also any text I have added to the email is gone.

The only workaround I've found is to scan the document into a file or note, then attach that to the email.

I try to use this feature every two weeks to submit a timesheet but it is always a frustrating experience.