So we got the tiles drawing, we can select random tiles to use, but we need the tiles to also be snapped to the grid if that is active in the preferences. Right now when drawing tiles holding down the mouse button a bunch of tiles is painted following the cursor without snapping into place. I don't know if this has been configured through some shortcut, but if not then this is a good suggestion that shouldn't take that long to apply.
A few suggestions for how to snap to grid:
Left ctrl + shift to snap to the tile size grid
Left ctrl + alt to snap to the preferences grid.