Changes are not occurring copied item

I think I have one of my properties messed up on my installation of Sketchup. When I make a cylinder and copy it, Changes to the cylinder do not occur on the copied item. It worked yesterday when I was following a tutorial. Today it’s like I forgot everything. Can anyone tell me what I am doing wrong?
Copy error.skp (94.7 KB)

make components.

Raw geometry, when duplicated, won’t share the changes.
Nor will the groups, each group retain its autonomy

Components however will change as they are “synchronised clones”


You have to make the object into a component to keep the connection between it and its copies.

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I am slowly learning the subtleties of this. When I make it a component, then copy, then actually work on the component, things work better. Thank you.