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". An STL file output from Inspire 2016 source is recognized as it should be after reloading.
Is it there a way to make an imported part to become a part that can be modified in Inspire 2016?