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Hello.
I export the skeleton from spine to bytes file and load it into Unity. In one particular animation, a single sprite is missing.In Spine

This is how it looks in Spine, this sprite is attached right in the timeline. - https://i.imgur.com/VrUOKoM.png

This is how it looks in Unity - https://i.imgur.com/jzSIGsI.png

In other animations, everything is perfect, no disappearance.
What could be the problem?


I imported the export files and the animation showed some kind of hidden key hiding the sprite. As I understand it, the problem is solved.

I hope I understood your last sentence right in that you've figured it out and that your problem is now solved. If not, please let us know.

A common error could be to use Animation clean up where it should be disabled: In general please be sure to disable Animation clean up upon export when layering animations or having attachment visibility keys in your animations, as it will remove keys that are identical to the setup pose.