if you are using max, just export to fbx as it is and then import in med.

if you are using other tools, just make sure that you have checked/selected "export animation" option in export dialog.

then import in med.

med import dialog will show you whats inside the fbx file, be sıre that you have selected all scenes(or frames whatever).

also there is an option like "convert to points animation" in import dialog. if you are using bones you may import bones and uncheck "convert to points."