Slicing in orca

How do I slice an *.stl file in Orca slicer? I am only being given the option to load *.3mf files to slice.

I just open them. Right click open with or just drag and drop or open command. Can you do a screen shot? I use the most current and I have 1.8 something as well. Neither gives any issue with STL.

No version of orcaslicer has ever banned the use of STL files.

Just click the Create New Project button and then once you get to the slicer drag the file into the slicer or open it from the menu options.