How to export DAE without diagonal lines and without face deletion into Blender

[tysongersh]

Problem Exporting DAE OBJ FBX to Blender w/o triangles for quad modeling for High Low Texture Bake for Mixer 2020

I got past the subdivide problem. Things look selected but they weren’t, once I really had edges select the action happened. Back to your problem, see how far this gets you: Export Collada with triangulate all faces. Import into Blender Edit Mode, A to select all. X to delete, but choose Limited Dissolve. You now have a pretty good starting point. I think that any remainder lines are due to faces not being exactly coplanar.

(This is my attempt to give Colin credit for the solution)