When you are creating an interaction to open/close an overlay and go to pick the color for your background overlay, the color styles from your document are shown only as thumbnails with no way to see the name of the style. This makes it difficult to find the correct color style for your background overlay if you have a lot of styles in your file. I think they should be shown as a list with their name as they also are in all other places in Figma.
Here’s how it looks when you pick your document color in the interaction details window. I think it should be just as they are shown in other places.
(I made an empty document with just one color style as an example)