You try to upload a file that's larger than 2 GB to a SharePoint Online library using a method other than drag-and-drop in the browser. The file isn't uploaded and you receive one of the following error messages:
This page can't be displayed
The webpage cannot be found
To resolve this issue, use the drag-and-drop functionality in a browser that isn’t in a diminished experience state to upload files that are larger than 2 GB.
This issue occurs because uploading files larger than 2 GB is only supported when you drag-and-drop files using a browser that isn’t in a diminished experience state. For more information, see the following Microsoft website: System requirements for Office.