Hi,
As I know there is no feature available to upload the file directly to Office 365 document library.
One possible methods is to subscription SSRS report and save to shared folder. File Share Delivery in Reporting Services . As you don't have UNC here, so I suggest to save the file to a new created local file. Then sync it to one drive folder or upload it along with some powershell script to do the automation.
Check this blog which shows how to do the file upload automatically : SharePoint Online Automation - O365 - Upload Your Files Remotely Using PowerShell To SPO Document Library
regards,
Lukas
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