A package draft is a version of your package before you submit it to the Asset Store. At a minimum, a draft represents the information on the Create new package page, but it can also include the Assets from your Project.
To create a new draft:
Open the Asset Store Publisher portal and navigate to the Packages tab.
Click Create New Package to create a package draft.
The Create new package page appears.
You can fill out the package details before or after you add your Assets to the package draft.
When you have a package draft, you can add and upload your Assets to it.