I took a look at your file. I’m not sure about if sketchfab supports camera animation at all, but at least I can help you with the saber and the model.
If you want multiple objects animated at the same time it’s best to parent all objects to a single armature. I see you have your saber parented to an animated empty,and when you parent it to the bone, you’d have to remake the entire animation for the saber.
Luckily blender has constraint tools, and to avoid reanimating everything by hand,you can just create a bone where you have your empty, use bone constraints to copy the transform data of the empty, and parent the saber to the bone instead." copy transform" or “child of” should do the trick, then bake the entire animation and then delete the empty.
hope this helps if not feel free to ask