Disappearing components!

I am trying to copy some very simple components from one file to another. When I copy them they just flash on the screen and disappear not to be found anywhere. Looking around I cannot find their original tag (layer) in the Tags Panel (layers panel) nor are they to be found in the Components panel.

What could have happened to them? I confess I am at a loss here.

Thanks.

Edson

Hard to help without the original model, and probably the destination model too.

Can you upload one or both to the forum, or if they are too big, to a file sharing service and provide a link? And say which particular component is this happening with? Or more than one specific one?