Here's a simple demo you can use to show server-side data refresh in JMP Live 17.
Report: https://devlive17.jmp.com/packages/H1vHBSnw1hkV2jCG4lfqg?cs=%5B%22SA%22%5D
Settings page where you can refresh the data: https://devlive17.jmp.com/packages/04QxZFzlH_j2NL5dpLtqy/settings
When you refresh, it pulls 20 rows randomly from the 1300 row White Polymer data. So it should be at least slightly different every time you refresh. For maximum effect take a screengrab of "before" to compare with "after".
Happy to give anybody view and/or edit permissions as necessary, just let me know.