I am following the tutorial “War Battles”, and at the very beginning, when creating the tilemap, the tutorial says that you can create a brush of many tiles by pressing the SHIFT and dragging on the tiles while editing the brush. This is in the section “Draw the game map”, in point 8.
You can hold Shift, then click and drag to make a selection on the current layer. The selection then becomes your new brush. This is a useful way to paint with a brush consisting of multiple tiles.
This appears not to work, at least on osx and with the editor version 1.2.137.
Either the tutorial is wrong or there is a bug.