This server forgets saved maps when it updates. Each save also downloads a copy: keep it, and Import puts it back.
Double-click or Enter closes a polygon · Esc cancels
Picking another tool closes it too.
z undo · Shift+Z / y redo · Delete remove selected
t top-down ⇄ birdseye · q e rotate · m map style
w a s d move · v select (drag a box for several, shift adds) · x erase · r / shift+r turn · 1–7 point tier · scroll to zoom