Adding an asset to a list

I’m sure i’ve done this before, but it doesn’t appear to be working for me today. I’d like to add an asset to a list (it’s a symbol to show that an interpreter is required), then control the visibility of the asset using a subset line restriction. When i drag the asset onto the list it doesn’t appear as a column. Using 2020.1. TIA

Hi Kevin,
I have just tried replicating the above scenario and it seems to be working for me. Please see the screenshot below and let me know if I’ve missed something in your question:

Ah, it was working, it was just 1px wide! have increased this and all ok now. Thanks for confirming

No problem. I’ve used 1px images (email broadcast tracking) and they can easily be missed on a busy page.