Hello! I apologize if this has already been posted, i couldn't find it in my search.
I have calibre on my main computer and it works perfectly, so i also downloaded it onto my laptop. I noticed though that when i convert books to pdf, it says it was successful and has the added file format of pdf. But when i save it to disk it always saves it as a opf. I thought maybe it could still work but the file is mostly just data from the conversion it seems like. I think i must be doing something wrong, but i'm not sure what specifically. I am attaching screenshots, of the book in calibre, the book in my documents after saving to disk, and the view of the opf document using google drive since i couldn't find an app that could read it on my computer.