baz1233 Did you select the Fit in the Size option in your export settings?
The default for this option is Scale, and if you use Scale, the size of the skeleton should be constant regardless of what the overall size is, but if you choose Fit, the size of the skeleton will be adjusted to match the overall size of the video file, so depending on the animation, the character may become smaller. If you want to keep the size of the character constant, you should choose Scale.
