Dear respected RDMas,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, I'm sorry and I'm afraid to say that Task Scheduler itself doesn't have native support for directly exporting Excel files from a network drive to a SharePoint folder. We feel your pain due to this limitation and we’re really feel sorry for it. However, we appreciate your understanding. I do understand the inconvenience and apologize for it.
However, based on my research a lot you maybe achieve using scripts.
I'm really sorry I deliver you bad news and I apologize for it.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad