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https://support.apple.com/en-am/guide/motion/motn125277a3/mac
Alpha channels in Motion - Apple Support (AM)
In Motion, import video clips or image files with alpha channels.
alpha channelsapple supportmotion
https://support.apple.com/en-asia/guide/final-cut-pro/ver52cf382e/mac
Use alpha channels in Final Cut Pro for Mac - Apple Support
In Final Cut Pro for Mac, use alpha channels to composite one image over another.
final cut proalpha channelsmac appleuse