how would an expression even be able to tell in which comp it resides, since it is actually in 2 at the same time?

It is not in 2 at the same time.

Method 1: There is only one copy of the precomp and the expression will check where it resides from the list of comps you give it to check against.
Method 2: Making a duplicate, like you said, that…

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Thanks for taking the time Robert!
You’re right I forgot to clarify that! “Picture1” is a comp and not a layer.

I am not working with essential graphics or master properties, I just duplicate the comps once and then use them as they are each time I start working on a new video.

I don’t recognize the authority of luck.
I have made a system that works…

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Hello everyone,

So to make it simple, let’s say I have a main comp, MAIN
and a comp that contains a template to use for pictures, called PICTURE CENTER, let’s call it P-C for easier reference.
in the P-C there will be layers named “picture1”, “picture2”, and so on.
Inside “picture1”, I put an expression on layer(x) to make the opacity either 0 or 100,…

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