I think it would be helpful to link to the guides when you introduce the shelf in the changelog 
Changelog — PsychoPy v2023.2.3
Also, is it possible that I could use the shelf for an issue I currently have where each observer only sees 25% of the images, but I cannot figure out how to load them specifically so they end up downloading 4 times the images, they need? I have more info about my issue here: Cannot use Static/Resource Manager Component to load images while observers read instructions - #2 by simon.dp