Wats up with a file ? its not rocket science to get something reasonably sharp if you keep on top of it.
Nothing for odd jobs. Most people will have a dominant arm though which will lead to inconsistencies. I know I do- on the left hand cutters I often find that I see a slight curve in the tip plate angle being corrected when I machine sharpen a chain I’ve done by hand in the field a couple of times.
Personally I like to stick a sharp chain on and sharpen a dozen at a time, only takes a couple of minutes per chain and gets you a factory finish- when done properly. It’s next to impossible to correct a badly nicked chain bending down over a stump- yet plenty try.
There’s a lot of s**t talked about things like grinders blueing chains or Screwfix flap wheels being the best thing for sharpening mower blades, and it can all be avoided by taking the time to learn even the basics about abrasives.