You can use the Explorer View option in SharePoint to move several files at once to a document library.
1. Go to the SharePoint page containing the documents you want to move or the folders you want to move the documents to.
2. Select the Library option at the top of the webpage.
3. Click the Open with Explorer icon. This should create an Explorer window on your computer containing all the documents in that SharePoint library.
4. Drag/Drop/Copy/Paste you documents in the desired locations.
5. Close the window once finished. The items should now appear on SharePoint in the desired location.