Aero animation

Your question: "How I can create model and keep animation to export to Aero?" 

You don't need to go through Dimension to export to Aero.  Simply take your baked FBX (or other supported format with embedded PSR animation) to Aero directly.  Make sure your animation is PSR based (or with simple rigged movements)

You can't create animation in Dimension. For now you can create any animation in Ps and export ir from Ps. As Ussnorway mentioned you can also use character animations from Mixamo.com. I am using that workflow for creating fashion podiums. https://salbi.myportfolio.com

you can't [yet]

Dimension will read most Fbx files to get the actual model and drop any attached info like animations... I assume you don't need human characters but if you do then have a look at Mixamo.com