How can I get attachments to stick and actually be sent with an email using 27.0.91?

[Sharon Kimble]

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I've just spent a frustrating 20 minutes trying to attach a pdf file to
an email to be sent with the email itself. I've tried attaching a file,
attaching a buffer, and also attaching an external pdf file. None of
them were successful, so how can I do it please?

Thanks
  Sharon.  
- -- 
Debian 10.2, fluxbox 1.3.7, emacs 27.0.91, org 9.3.7
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