(2020-04-21, 2:12)Moe Wrote: ok, let me try it again.
Got it! Well, everything looks OK on the LDraw side—looks like you've solved the submodel issue. So it must be something with LDD; and since the grid looks fine, I'm guessing it is just that the parts are missing from LDD.
Just in some cursory web searching, I see there are issues with EV3 parts, specifically, being absent from more recent versions of LDD (here's one example). The workaround, unfortunately, seems to be to try and find an older install that you can revert to, or just switch altogether to a program that's still actively developed.