Pages v13: How to send a copy of any export format via Mail
In Pages v13, (macOS 12.3 or later), Apple has allowed one to Share a document, export as a another format, and then automatically attach it to an Email. This is done from the Sharing tool on the toolbar, or from the File menu > Share… menu item. By selecting Export and Send… you choose the export format to attach to the email.
If you just want to attach the current Pages document to an email, then select Mail. The document must be saved first.
Mac mini (M2, 2023)