This article details how to upload static Excel files to the BI360 Web Portal (dashboards and live reporting) because it does not contain BI360 fields.
For this to work you can add one field from BI360 Report Designer (Excel Add-In) onto a sheet hide that sheet copy all other data from a 3rd party into excel upload the report to the BI360 Portal by selecting the upload button on the top right corner of the Library Administration window. This will get you around the requirement for an upload to the BI360 Portal. With this method you will be able to upload any Excel file to the Portal.
BI360 Portal 4.x