How to access MS Graph from ASP.NET Core Web App completely using HttpClient without consent

Question

How to access MS Graph from ASP.NET Core Web App completely using HttpClient without asking any credentials to users (i.e., Silently taken some default users). Below are key requirements:

1. A public facing ASP.NET Core Web App without asking End uses for Authentication having just 1 page allowing them to upload their file
2. The Uploaded files from Web App needs to be saved in either OneDrive / SharePoint (This is @ Enterprise i.e., Specific Tenant based)

So in summary it's like we need a public interface to allow anyone to upload and those files should get stored directly in our OneDrive / SharePoint without asking users for any kind of login / consent using MS Graph.