Hey there,
When connecting everything in prototype mode my overlay is not showing as clickable at all even though in prototype mode it shows as being connected correctly to the right artboard. The overlay settings are all right. I played around with the animation thinking maybe that was but no.
I thought as first it was the viewport height as I had that set quite short and this was a scrollable page. The overlays are also throughout the page so at different heights. Therefore the viewport height would have to be set at the bottom of the page if this is the issue.
However when I changed that to the bottom of the page absolutely nothing was clickable anymore. Not one thing worked in preview mode. Though the rest all worked previously with no issues.
Im new enough to XD so maybe im just missing something but I've had overlays work perfectly in the past so not sure what im doing wrong?