Modifying existing animations?

The fact is that animations cannot be exported through the editor; the editor complains about the lack of files containing the export settings.

And what makes you think that CrazyPill had these files? And why do you assume that someone is "withholding" something from you again?)

Added 2 minutes later
I've noticed that you often say "fact" and "I'm one hundred percent sure," but the information isn't always correct. I'm not trying to "attack" you, but I think it's best not to be so confident about things that haven't been fully verified.

Added 47 minutes later
Elu, to tilt the skeleton using the "global" bone, it must be the root bone (meaning the highest in the hierarchy) for all other bones in the skeleton. By the way, it might seem strange, but my animations, when tested with animations from Heroes 7, are exported normally without a 90-degree tilt.