I successfully uploaded a Web Layer to AGOL (Yay!), and the time-slider function works (yay!), but the layers draw much too slowly, so it goes blank in between layers, and then draws the layer in jumps and starts. Should I try sharing it again, but instead of selecting the Feature option, do a tile or vector tile format?
Another issue is that the time-slider function won't allow me to do custom time periods, but I see other's with the same problem on GeoNet and no solutions yet.