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Fireball and mushroom cloud rising at 13:23 in this video and thereafter are from the Nagasaki explosion, not Hiroshima. Footage of actual Hiroshima cloud rising can be seen here on YouTube by searching "Harold Agnew Atomic Bomb Film," from 1:10- 1:40 (late cloud) and early cloud rising from 2:36- 3:01..... in case anyone wants to see the real thing. It's rarely used in documentaries because it's very grainy, shaky and is damaged somewhat.

Fireball and mushroom cloud rising at 13:23 in this video and thereafter are from the Nagasaki explosion, not Hiroshima. Footage of actual Hiroshima cloud rising can be seen here on YouTube by searching "Harold Agnew Atomic Bomb Film," from 1:10- 1:40 (late cloud) and early cloud rising from 2:36- 3:01..... in case anyone wants to see the real thing. It's rarely used in documentaries because it's very grainy, shaky and is damaged somewhat.
https://youtu.be/eGl7HQ3PmN4