The object I designed has about 34 faces, pretty simple and not complex. So I dont think that would be the issue. And it sounds like your software has the stl option like my old version used to. But now the list is missing most of the file type options including stl. There are only like 8 or so options on my list in the Save As ( mostly jpg, png, etc.) Nothing useful. I have never had the commercial, just went from 2019 version to the 2020
Is there any other reasons why it wouldnt be showing all the file types including stl like it was before?