I am trying to create or find an angle iron structural member. I created one and saved it in the correct folder because it pops up when I try to select it. However, it says "Library Feature is empty." I have 3 other angle iron members in the folder, but this new one does not work. I will attach it here. The 1 x 1 works while the 1.5 x 1.5 does not work. Also, when I try to open a .sldlfp file from the file explorer, it asks what app to open the file with and choosing SolidWorks does not work. Any Ideas?