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Cool! You create you own top-level thread using the tag #container and then you can post a bunch of images in there (5-20 is a good amount) for any topic of your choice. Then you take your top level container and post re-thread that into the megacontainer (check the megacontainer to see examples)

This threadstorm also has more details: https://inleo.io/threads/view/mightpossibly/re-leothreads-jxkbdh3w

Now it's clearer. I think I'll try it later.