Make sure to save your vector designs as a .PDF in your graphic software.
DO: After you finish designing your vectors in your program such as Adobe Illustrator, CorelDraw or InkScape, save the file as a PDF. This is an important step, because this file type will save all your vector data no matter what vector software you use.
You will noticed that every node of the design is selected, which means that this is an editable vector and not an image imported in to the file.
DON'T: Drop a JPG or BMP or any non-vector image into a PDF or SVG or any other file extension.
This will not process and will result in your order being cancelled.
You will know that you just imported an image into your vector editor when the "trace bitmap" is bold. This is circled in red for reference. There are no nodes visible. You see the corners of the image selected.
You can download this vector file to see the difference between a vector and a .jpg image.