For those not familiar with the characteristics of polarizer filters the previous video would be helpful. However a valuable bit of information left out of the video (and surprising not mentioned in this thread at all) is that the polarizing effect is at its peak when the camera is pointed 90° in relation to the sun. It will have no effect at all when pointed directly at or directly away from the sun. Therefore, if the drone is rotated 360° while hovering, the sky will change from a darker blue to a much lighter blue and back again as it passes 90°, 180°, 270° and back to 0°. So if your flight is more or less a straight line, perpendicular to the sun, a PL filter will indeed improve your shot. If your flight will include turns toward or away from the sun, you’re better off with a regular ND filter and dealing with blue skies and reflections in post production.