Cannot draw texture image I am trying to draw color to a duplicated face. If someone could help me, it would be very appreciated. I am actually working on eye painting but tried if easy sample also have same problem or not then it happened.
What I did was below.

Create a new general which have a cube.
Select face (3) below in picture right pane and duplicate it(shift + D) and move to (2).
Put a loop cut which is (4).
Select (4) and duplicate it(shift + D).
Move the duplicated edge and move to (1) place.
Grid fill the edge.
Select all and made a texture paint slot.
Paint on unwrapped 2D in left pane.


I can see the blue paint was applied to cube and duplicated face which is (2). However, never be able to paint on (1). I even tried to paint on right pane but also that did not work.
I went to Edit mode on right pane then select each face. Other than (1), I can see the face was selected on left pane but nothing I could see for (1) selected.
I guess, it does not recognized as a face in blender. Can anyone help me to do fix this situation? I would like to paint on (1). Thank you for your support, in advance.
The new plane (1) has no UV coordinates. You have to select all faces and unwrap them. Then you should be able to paint on all.