Wavefront .obj is probably the closest thing to a de facto universal 3D file format standard, but it doesn't support animation and has limited support for norma

Wavefront .obj is probably the closest thing to a de facto universal 3D file format standard, but it doesn't support animation and has limited support for normals (which is a problem if you're using normal mapping). There have been various attempts at standardizing 3D formats that include animation and modern features, perhaps most notably collada, but like most formats striving for standard status as a goal it ended up being a bit of an over-architected mess. Having something like the Unreal Marketplace sidesteps this situation a bit in that any content available there will be in Unreal Engine/Editor friendly formats, so it should be relatively easy to mix and match it with other things from the marketplace.