Blender to Sketchfab -- booleans not rendering properly

Hello!

I recently built this stereo stack in Blender. The areas in question is only the mesh that has booleans applied…I believe that mesh has no thickness and is empty, but that shouldn’t be a problem. The boolean when applied seemed clean by my standards…no messy or irregular faces…although it does look like there may be the some n-gons in there? I don’t know…the images below are from Sketchfab…in other programs (Blender and Subst Painter) everything looks fine…

I tried both OBJ and FBX, and both meshes import with tearing…

I looked around for answers, but none of the topics solved my issue.

Thanks in advance!