BlenderToStrideAnimationSeparator
A Blender 2.90 addon that exports actions as separate fbx files for use in the Stride3D Engine.
Usage
Install the addon and select File > Export > Split and Export Animations. It will export all actions that are saved using a fake user (have the little shield with a checkmark next to them) as individual fbx files in the same folder as your .blend file. The naming scheme is blendfilename_action.fbx. Import to Stride. Every fbx contains a single action, the mesh, and the skeleton.
You can also search for Split and Export Animations in the f3 menu.