Oh, I forgot to mention. This is the remote that has worked well for me: https://www.amazon.com/gp/product/B00RHD861S/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 Just make sure it’s compatible with your camera.
And this is one that DIDNT work: https://www.amazon.com/gp/product/B00P28JQKA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Correct me if I’m wrong, @buddingphotographer, but I think the difference is that the first one uses “RF”, a radio frequency, versus the second one that uses “IR” infrared light. https://blog.1000bulbs.com/home/ir-vs-rf-remotes-whats-the-difference