Siri

I’m having issues with Siri understanding what I want. I’m not sure if I don’t know how to communicate with it or if I’m just expecting to much. (Ex. I have a zip file on my notes app, when I ask Siri to open the file, it tells me it can’t find a zip file app or it copies what I said to notes) Is there a guide or manual that can help me with Siri?