Presets of our own (blocks 1300 and 1310) show what the Channel Info stores for a chosen
channel.
- EXtractoR: each record is a kind in byte 0 and the channel name. Named channels are
imported by name (Z, Z, Z renders equal to After Effects) and `(copy)` as the input's
own channel. The kind is byte 0 only: one definition default has `02 00 00 32`.
- IDentifier: byte 19 holds the chosen channel's name, `Object ID` when none is chosen.
After Effects lists only UINT channels and leaves the layer unchanged without one, which
the loss now says. A chosen `ObjectID` / `MaterialID` channel (any case) is the one
EffectCraft reads itself, so it imports without a loss; other names are reported.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>