[Blender] Multiple objects animation

Hi, I searched everywhere but I didn’t find anything about this.
I want to create a scene with different objects animations but when I import my blend file in Sketchfab every animation is separated. I want them merged to create just one animation in the project. I’m using Blender 2.8

See my reply in this thread: How to merge animations?

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Thanks for your reply. But how can I use this? Can you please explain me if you can? Thanks

First you need to install Python on your computer. Follow the instructions in this video: https://www.youtube.com/watch?v=tCYsBsN1RNg

After install, open the Command Prompt (cmd)
Type “py” or “python” and hopefully you will see some text showing you the current Python version installed. If not, you must add “path environment variables” as described in the video.

Once you successfully get version feedback from the “py” or “python” command, open a command prompt window in the folder where your glTF file is. See instructions in this video: https://www.youtube.com/watch?v=bgSSJQolR0E

Type "“gltf_merge_anim.py in.gltf out.gltf” (replace “in.gltf” with the name of your glTF-file)