The YouTube account of Bob Webb has a high quality 4K video shot from the cockpits of P2V air tankers in 2016. I doubt if you’ll be able to appreciate the resolution on a mobile device, so check it out on a large monitor if possible. (When you click on the “gear” icon at bottom-right there are eight choices ranging from 144p to 2,160p. Go for the gusto, with 2,160!)
In spite of the wide angle lens on the camera at times you can see the lead plane out ahead, a little white dot, release smoke to mark the target. There is no view of the retardant being dropped, but a couple of times you can see the shadow of the drop.