Whether a footage file is there is an observation (footage.check sets
Footage::missing without an edit), not part of the footage. The
signature leaves it out, and keys saved by 0.22-0.24, which hashed it,
are recognised with the file either online or offline. Warp Stabilizer,
3D Camera Tracker and Roto Brush analyses are kept through the next edit
while the footage is offline and after it comes back.
arnav-hiwarkar
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