There are two variants for cuff processing. The first variant is the simpler one, in which you stitch the cuff all the way around the edge. But if you don't want any quilting on your cuffs and you're a sewing professional, then dare to try the second variant.
Variant 1: Iron the lower cut edge of the inner cuff with 1cm around...
... and sew the raw edge of the outer cuff to the prepared sleeve. Sew up to the notch of the understep. The upper photos are for orientation of the right arm, a cuff can always be tightened and opened backwards.
The cuff is then placed, right sides together, against the fold and the corners of the top and bottom flaps are stitched. For curves and corners, seam allowances are shortened with scissors and cut or cut off. The corners do not become too thick when turning and the seam allowances can be laid flat. It is particularly important that the seam is not cut. That's why we recommend that you sew just before the point and from there with a smaller stitch length. This guarantees you a corner that won't fray as quickly after trimming.
After turning, you should shape the corners with a corner and edge shaper and then iron them out. Finally, sew the previously ironed raw edge of the inner cuff firmly by stitching the entire cuff from the outside (right side of the fabric) all around the edge.
Have lots of fun with it