For your favorite colors or brand colors, you will need to use the hex code value. We're sorry there's no 'upload colors' option just yet. Just click on the icon, text box or graphic element you wish to modify. Then click the paint bucket icon in the top toolbar - there you'll be able to click the + sign under "Recent Colors" to type or paste the exact hex code value on the column for backgrounds, text, shapes and single-colored elements already in our library of graphics.
Here are 2 examples:
Here's a great blog article! How Well Do You Know Your Brand Colors?