A stitch file can look perfect on screen and still pucker a polo, snap thread on a cap or lose the lettering on a school jumper. Those faults are built in when the file is made, which is why a cheap auto-converted file often costs more in spoilt garments than it saved.
Our digitisers build each file around the garment you name, the finished size and the machine you run. If a sew-out isn't right, reply to the delivery email with a photo and we adjust the file at no charge, however long ago you ordered.