You cannot save Bake Animation settings (Start/End/Step values) in Preset files. If you created a preset that had specific settings for the Bake Animations values, these values will not be used the next time you load the preset. Instead, the FBX plug-in will always default to the values set for the scene's timeline.
For example, if the animation in the scene is 102 frames long, the Start value will be 1, the End value will be 102, and the Step value will be 1, regardless of what is values you may have stored in the preset for this setting.
