Thanks @James Tedrick. I figured out how the choice filter will be a workaround for my original plan to use external data. The search () feature would really be valuable with dynamic lists. During testing I also realized that multiple CSVs can be used with a survey. I see this very valuable too. But then at what point will the survey be efficient in terms of file sizes and publishing. I see the importance of load time but it would nice to also see the file size and the size threshold - which could be different based on network speed.