RemDust but I'd like to anticipate how I could "push" or at least allow my players to update those data later on.
What exactly do you have in mind? Do you want to replace e.g. version 1.0 of your skeleton asset with an updated version 1.1 with identical or at least very similar setup?
In general, you would normally not upload and replace only the exported asset, like the skeleton.json or skeleton.skel.bytes file, but also the dependent Unity asset, the SkeletonDataAsset, along with it. Same applies when updating the .atlas.txt file and the atlas textures (.png files), and the dependent AtlasAsset, you would update all three at once so that they are definitely compatible. If you updated only the skeleton.skel.bytes file, you would need to make sure that the animations have not changed which are referenced in the default mix duration in the SkeletonDataAsset.
Most of the time there will not be any issues when updating only the exported assets, but to be on the safe side you should update the generated assets on your server along with it.
