Importing .obj mesh to Studio: parts of mesh get corrupted

[TheCaiusJuliusCaesar (Caesar_SonOfMars)]

I’ve been trying to import this tank turret as an obj. Here’s a screenshot of the model in Blender:

The issue is that the sidehatches get angled incorrectly when imported into Roblox:

Any way to fix this?

[Hazelfluff]

did you check for inward-facing mesh normals?

In edit mode check face Orientation and make sure it’s all blue. The Red means the normals are facing the other direction.

to fix. Select the Red faces and press Alt + N Flip