Man, this is great info! Thank you for this! Have you ever run across geometry quality importing differently between these two? I'm importing a hard surface mesh, and one imports fine (drag/drop), but Importing To Level shows several polygons in tight corners as missing. I've tried several different settings but its happening consistently. Frustrating as I'd like to keep the hierarchy of Importing to Level! (I can share pics if you'd like)
Sorry to hear that. I can't say I am 100% sure, but I usually mess around with recalculation normals in Unreal. You could also try messing with your ohing tag in C4D or deleting normal tags if that have those. I would assume your polygon normals are not inverted, but something to keep an eye on too. Unfortunately, there are a lot of things that could cause the issue. Best of luck!
I'm also having similar issues on UE 5.3. Did you find any solutions? Sometimes imported object's scale/location is slightly wrong or some meshes appear broken (as if their LOD5 has been loaded) and sometimes it just work fine, it's inconsistent.