They do not have to be zipped or compressed, just attach the original .CSD design to your E-Mail. Include your full name for credit. I will zip them and create a Gif graphic. The following is the result of my research on using underlay stitches. The underlay stitches are put into place first and are there for three reasons.
Underlay attaches the fabric to the backing.
Underlay supports the top stitching by raising the stitches up out of thick or soft fabric. Also, the larger the area, the more underlay is needed. In other words, the more pull there will be in the area of stitching, the more underlay will be needed. Underlay stitching includes manual outlines stitched before the fill. The embroidery industry creates designs with a specific purpose and fabric in mind.