1. Navigate to the desired SharePoint site.
2. In the navigation menu on the left, select "Documents".
3. Navigate to desired folder location in SharePoint documents.
4. Select "Upload" in the task bar located above the file path to open drop-down menu. In drop-down menu, select the "Files" option.
5. A Windows File Explorer will open. Navigate to the folder location of the desired file(s), select it/them, and click the "Open" button.
6. Back in the browser, you may be prompted to confirm the upload. Click the "Upload" button to confirm.
7. You will see a spinning icon appear in the upper-right corner of the Documents SharePoint page. Depending on the size of the upload, it may take a while. You will know it is done when you see the results appear.