Okay; thanks.
I thought that that's what I'd done, but a 'hover' over the image I embedded, shows a link back to the hosting site, which doesn't happen with your embed.
I'll try again, the next time I need to do such an operation; I must have messed up somewhere.
Peace.
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M<downarrow>you see in the upper right hand corner of comment areas and post areas, links here https://guides.github.com/features/mastering-markdown/