After you unlock a Stage 3 in the POTM Program, can you still get points from the Stage 1 & 2 missions?

Does anyone know?

I going to guess it's the same as TA programs and say no.

From my experience, you can not. So say you were saving an exchange or collection for +5, in stage one to use in stage two, you would be sadly disappointed.

no, each step maxes at 25 points