EDIT - post deleted.
It was a post about how to set up waypoints that could be displayed on the Instinct solar to get ETE and distance to next waypoint. The use-case is mountain hiking and long distance backpacking and I'd like to add waypoints to courses on the device such as Summit, River Crossing, Descent Point, wild camp locations, water, etc. I thought I'd found a way to do it and it worked fine for a short time before, for no good reason, it stopped working today. Given the large number of posts scattered across the Garmin forums on how, allegedly, to do this and the number of people struggling with it, I thought it best not to muddy the waters or raise anyone's hopes so i deleted this post. None of the methods work for me and I'll live without Waypoint information on my hikes and rely on a paper map to estimate times of arrival.
The Instinct Solar is a great piece of kit if you spend time away from charging points, like multi-day walking but if you want to be able to use Waypoints then in my experience you'll also need a paper map and a Sharpie.
Thanks to everyone below who tried to help. I've tried plotaroute, I've tried synching from the Connect app. I've tried direct upload of plotaroute and Connect FITs via USB. Now I've given up.