In Nucleus it is possible to upload documents to your organisation space to allow for instant sharing. Anyone who is in your organisation will have access to the files/folders you upload. You can make changes to this by setting up your own permissions. To read more about changing permissions in a shared drive, see here.
To start the process of uploading documents to an organisation space, click the name of the organisation and then click Documents
Click on "OrganisationName" Documents as illustrated in the below screenshot
This will present you with two options where you'll be able to select the files to upload or create a folder.
Clicking the Add File option will allow you to search your computer for the files you'd like to upload. Alternatively you can drag and drop and files and/or folders into this space.