Hello Everyone,   I just started to use Inspire and I did the introduction problems on Altair's Moodle. I know more or less how to draw and modify the structures.   However, I noticed when I upload STL file from alternative source to Inspire 2016, it seems like a piece that I cannot modify or it doesn't appear in analysis any way. I would like to run analysis stage on the imported STL file before I modify it at any way. The piece appears as "Invalid feature or associated part