How do you forward an email as an attachment of another email on an iPhone 7? [duplicate]

This may be the most easy question to answer but I have struggled for few days now to get a proper view on how to achieve attaching an email on another email in iPhone 7.

I am a new iPhone user and would like to achieve

1. Attach existing email onto new email
2. Attach existing email to a reply/forward email

Is this at all possible?

You can now drag and drop emails onto an email draft that you're editing on iPads that are running iOS 11 or iPhones running iOS 15.

1. Create a new email (or forward or reply to an existing email)
2. Swipe down on the email title bar (where it says "New Message" or the subject line) - you should now be able to interact with Mail again
3. Tap and hold on the email in your inbox list that you want to attach (it will appear to pop up)
4. Drag that email to the title bar of the draft email at the bottom of the screen until the edit window pops back open
5. Continue to drag that email to the body section of the email draft and a green circle with a plus sign will appear on the email that you're dragging
6. Drop/release into the body of the email you're editing - you should now see a .eml file attached

Currently, you can't send an email as an attachment on iOS. The only functionality available is to use the Forward button to quote a copy of the email (with or without the original attachments).

(On macOS mail.app, right-click on a message and select Forward as Attachment.)