Doodle is a tool you can use to post your illustrations within a group. Using it involves the following:
■ Functions
・Undo
・Redo
・Zoom in
・Zoom out
・Color picker (right click)
■ Shortcuts (sans quotation marks)
・ "a" - switch to transparent
・"z" - undo
・"y" - redo
・"j" - zoom in
・"k" - zoom out
・"," - shrink pen
・"." - enlarge pen