Egyptian hierogplyhs

I have solved the three upper puzzles. The bottom puzzle is revealed (the code appears to be three squiggly lines) but I can't get the columns to move. I have
pressed above and below, both of which give me the blue cursor, but neither works.

I still have the duster, and I have tried to use it, but it still doesn't let the tiles move.

I have all the objects.

I have read all the old conversations, and none answers this specific question. The closest answer I get is that I should press above, not below, but that's not working for me, either.

Many thanks.

Use the duster on the three marks below the upper puzzles. Then the lower puzzle will work.

Thanks! That was indeed the solution.

Onward.

Carol