How to convert sldasm file to stl file?

It's actually as simple as using the "save as" and choosing the STL format

Edrawings does not need the parts, only the assembly.

Here it is

If an assembly file is saved in STL format, it creates STL file for each component individually. To get rid of this situation, first save the whole assembly file as SLDPRT then save it as STL. Now, you will get the whole assembly as STL in one piece.

@Zulfiqar Islam. My SW is in portuguese, but you can see the option there.