Assets is a private repository on an Anaplan tenant where page builders and workspace administrators can manage images and chart palettes for pages and charts.
You can access Assets in Anaplan > Home > Assets. From here you can work with images in the image library and manage your color palettes.
To manage Assets, you must be a page builder or a workspace administrator for at least one workspace in the tenant. Images uploaded to Anaplan and the color palettes selected are accessible across the tenant. If you've access to multiple tenants, you can only see the images for your current tenant.