1. Making Vector Brushes 2. to save in CC Libraries to 3. Use in Adobe Fresco

Hi, I had an idea for creating a vector art brush for use in Adobe Fresco, I so I built one in Illustrator and I went to save it in the CC Libraries and intially I tried dragging and dropping it from the brushes pallette into the CC Libraries Window and it did not work. So I used it to draw a vector line and drop it into the CC Libraries Window. It would not save: only recognized the color and the graphic I drew with it.

Help!