Microsoft SharePoint | How to Add a File to SharePoint

How to Add a File to SharePoint

You can drag files and folders from your computer to upload them to your OneDrive library or SharePoint team site with the modern experience.

https://support.microsoft.com/en-us/office/upload-files-and-folders-to-a-library-da549fb1-1fcb-4167-87d0-4693e93cb7a0

Create and share files in a library

In a Microsoft SharePoint document library, create a new file, upload your own, and then share it with others.

https://support.microsoft.com/en-us/office/create-upload-and-share-files-in-a-document-library-98cb2ff2-c27e-42ea-b055-c2d895f8a5de