Directory Opus Template for External conversion to HEIC

[Leo]

@David

I'm not sure when this was added

It was added in Directory Opus 13.18.2 (Beta)

@David

It is useful for me to have that if only to reply to a friend of mine limited to his iPhone.

iPhones can display the other formats as well. There is no need to convert to HEIC for them if the image isn't already in that format.