Styleguides are treated like projects—you will now be able to view your global styleguides in a separate tab and select one to export directly to it (without the styleguide being linked to a project!)
If you have document colors and text styles set up in Sketch, you can simply select a symbol or artboard in your Sketch file and export it like you would a regular artboard. The Sketch plugin for Zeplin now contains two new export options: “Export Colors" and “Export Text Styles".
In Sketch, Figma, and XD, if you have document colors and text styles set up, when you export into the styleguide, Zeplin will detect these and show them as suggestions to the styleguide's color and text styles section so you can immediately add all of them or pick and choose which ones to add.
Keep in mind that linked global styleguides inherit colors, text styles and components from the parent styleguide, so you only need to export the colors, text styles and components that are unique to that specific styleguide based on the platform type (Base, Web, iOS or Android). If you have project level specific resources, you can include those in your project styleguide instead.