Portal 2

Portal 2

Community maps. For science.
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Edit old test chambers I've created
Hey all
I want to modify my old test chamber I created, however I can't seem to find it in the chamber editor

I have it in my workshop, I can subscribe and play it however theres no option to edit it or copy it to create a new version

How can I do it? I created this chamber around 10 years ago

Thanks!!