Using Your Own Functions With Remote Control Web Interface Plugin?

Hi! I had downloaded Epic’s Remote Control Web interface plugin and I was trying to use it to change the texture on a particular plane. Having a parameter in the material that switches the images did not do anything when it was exposed to the plugin, but it did recognize that an on/off switch was an appropriate widget in the UI. The plugin has an option to add functions as something you can control with the UI but when I went to find a function I’d made, it was only giving me function libraries.

“Set Material Instance Scalar Parameter” seemed like the best fit for what we were doing and seemed to expose all the right properties, but when we exposed it to the UI, it did not find a widget that was able to be paired with it, so it didn’t add any control. Anyone have much experience with this plugin? Thanks!