In my settings, I have the following selected:
Export only current selection
Triangulate all faces
Export edges
If you want me to, I can take a look at your file and try to figure out how to get around the problem.
Thanks to Burl who helped me find some mistakes, along with some other errors I found, I have successfully drawn and uploaded the drag wing pieces. I’m going to try and make sprues to connect all the pieces and see if that changes the pricing from 5 pieces to 1 piece. Other than that this part is done. I have a few more parts to make, but it’s been a big learning curve on this one, so hopefully the next ones will go a bit faster!
Edit:
I added sprues to connect the five pieces into 1 piece. The price changed from $13.41 to $13.42. But I need 2 of those, so I copied and pasted everything and uploaded that file. 10 pieces down to 1 piece and the price is $22.26 verses, $26.82. Not bad for a few seconds of positioning and adding sprues. I think I will try and design all of the parts and combine them into 1 part.