Hi,you can load your own avatar if it is vrm format(your can make vrm avatar use vroid app,and download vrm avatar from vroidhub),and you can open your local vrm avatar like this:
1.push your vrm avatar file into oculus quest.(using sidequest app or adb command line for example:adb push xxx.vrm /sdcard/)
2.press the "Avatar" button in the DDM(Dance Dance Maker), and you will see the load vrm dialog,then navigate to your vrm file path and open it.(If you want to navigate your path to sdcard root,simply press the first line ".." in the opened vrm file dialog)
For animation cases,you need a custom tool to convert FBX animations into DDM supported format,and then load it like the above process,but press "Anim" button instead,it will open anim file load dialog. Or you can wait for an upgrade, DDM will support BVH animation directly.
For temp animation solution, you can send the animation you want to use to me,and I'll convert it for you(.FBX to .anim format).