hey so i've used a few different worship tools before (like propresenter and easyworship) and from my experience, native google slides integration is pretty rare, almost non-existent tbh. most of them are built for powerpoint or keynote. you'll probably have to export your slides from google as a .pptx file first and then import it. it's a bit of a workaround but usually works ok. some churches just build everything directly in the worship software to avoid issues.