The File Storage location controls where Excel files are stored within your organization's Office 365 infrastructure. If you need to change the SharePoint site that these files are stored in, you can follow the steps in this article.
Since managing the File Storage section of the Cosmos Portal is an administrative function, only users with the Administrator role assigned to them can see it.
To edit the File Storage location, log in to the Cosmos Portal and navigate to Administration -> File Storage.
You can then click the Edit button to change the File Storage URL.
You can then paste in the URL for the new SharePoint site to be used for Cosmos File Storage. Once this has been updated you can click Save to save the changes or you can click Cancel to cancel the operation without making any changes.
All Cosmos reports that are run or opened will now be saved in the new SharePoint site.