can't draw anything on canvas

[KrLikeblue]

Hello,

When I try to create new canvas then select some brush and color, then when i try to draw on canvas. it draw nothing

Can you help me with this ?

Thanks

[KrLikeblue]

Is anybody watching this code ? Please help me.

Thanks

[liuchaotclc]

doesn't make a file when open a new document