Apple Mail attachment issue

Sending any file via Apple Mail, be it document file, image file etc may appear as Embedded at your end.

As pervious posting indicated, the Recipient e-mail Client ( Application ) will render it as it sees fit to do.

That is beyond your control

The other option - use a different e-mail Client that may allow sending things a file attachments but remember - the Recipient e-mail Client is still involved

You can control-click on an image in your e-mail, and choose "display as icon".

But:

You must realize that how the recipient sees your e-mail message is outside your control.