Zeplin automatically exports assets marked for export from image layers in Adobe XD. To mark a layer for export in Adobe XD, select the layer open the Layers panel, hover over the layer, and click the export icon.
You can also check the “Mark for export” option at the right bottom of the screen.
You don’t need to worry about the export sizes of your layers. Zeplin will grab all necessary images with different scales and formats automatically, tailored to the platform you’re designing for—Web, iOS, Android or macOS. Simply clicking the layer inside Zeplin will list all these assets to developers.