OK, the following link is to a set of tutorials not done by Reallusion, but by Spiral Graphics.
On this page scroll down a little until you see Part 2: iClone, watch the video all the way through because it explains how to operate the switch camera command using the time line. It also offers a lot of other useful tips.
By the way it won't hurt to watch the finished Gas Tank Promo video.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.