Rigs/animation/Rokoko/Mixamo, etc

It seems like you're facing an issue with imported rigged characters in Blender, especially with animations becoming detached when you leave and return to Blender. To address this, make sure you've correctly linked the animations to the character, possibly by using the NLA editor or Action Editor in Blender. As for editing bought-in figures, you can make adjustments to the rig or materials using Blender's tools, but be aware of licensing restrictions that may apply to the purchased assets. https://ioniasports.com/

Do you use the Rokoko add-on to retarget animation to your model? If so, set the frame range to match the Rokoko animation, and then you can find the retargeted animation in the Action Editor. I hope you'll find this helpful.