For this mobile project below, the design elements unfolded as many of the user flows were created and approved. This is a good point in the process to begin a design system because enough of the design patterns have been established, such as colours, fonts, icons, navigation elements and buttons. At this point, I have confidence that these items will be used repeatedly throughout this design (and beyond) and should now be made into assets.
For this example, a main document has been created with all of the (artboards) that have been designed so far. Now, let's turn into this a full-blown design system!