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It was technical - probably my incompetence. The article was long enough, the pictures were free. I simply could not get things to load and to check them to see how they looked. After about a half hour of trying I gave up - I had other work to do.
While creating a new hub, you must have clicked the button "start a hub" at the top right hand corner of your profile page. Post title at the title capsule and paste it in topic column to choose category from the window, click continue and start hub