Where to place output button below file field

enter image description hereI have multiple function which includes one or two file as inputs and a file as an output. I am not sure how to align the output button.

  1. Right align with the browse button of the field
  2. Left align with the field
  3. Center align to the control of browsing file(which contains both file field and'browse' button).
Tags: , , , , , ,