Unfortunately, that’s using the mailto: method, which does not allow attachments.

for example, in a terminal you can do this:

open “mailto:foo@bar.com?subject=test&body=blah&attachments=requests.jpg”

and you’ll get a mail with To, subject, and body filled in, but not attachment. variations that change “attachments” to other forms (“attach”, “attachment”, etc) have no effect.

So, we can create new messages with existing instances, but it doesn’t allow attachments… can’t win.

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