Hey Lentro,
we took a look at it and found some cases in which the export could go wrong. We fixed these recently and uploaded them. If you take the new scripts from your game download and install them, animation exporting should behave better

While we were at it, we also made a guide about animation creation/exporting. You'll find this new section
here. It should provide you with the needed information on our setup and export flow + examples (+ files) for the different cases you might encounter.
Yes, as long as your new models are skinned to the same skeleton/rig, animations will be able to work with them. You can check our
Character tutorial page for those skeletons. (The playable race armor files include the race's "rig" as well)
Sincerely,
Kevin