I put the embelishments on before quilting, than the stitches for attaching are hidden between the top and batting. just be sure to watch closely while quilting to avoid hitting a button or stitching down something you wanted to appear in 3D. Just finished a 48" wall hanging that is peiced, appliqued and embellished for a quilt show themed quilt entry. will post a picture after the show the end of september. hope to place, put alot of work into it.
but if doing hot fix type crystals - after.