Zeplin automatically fetches colors of an Adobe XD document when you export any artboard or component in it.
☝️ Make sure your Adobe XD file is saved locally on your device before exporting. Due to a technical limitation, it’s not possible to export colors from a file saved on Adobe Cloud.
These colors will be suggested under the Color Palette section in your styleguide. You can either add them all using the “Add All” button or click separately on the ones you want to add individually.
If you ignore them once by clicking “Ignore these colors”, Zeplin doesn't show these colors again on your next export, to not bug you all the time. To reset this, select “Help > Reset Suggested Colors” from the menu up top, while you're in a project or a styleguide.