How do I upload files/folders to Google Drive?

You can easily add files & folders to Google Drive by uploading them from your computer. There are two ways to add documents:

From file explorer on your computer, you can click on a file and drag it into Google Drive. You will see a box in the lower right hand corner showing the progress of the upload.
Click on the + New button in the top left corner and choose File Upload/Folder Upload. This will pop up the file explorer on your computer, navigate to the file/folder you wish to upload and click "Open". You will see a box in the lower right hand corner showing the progress of the upload.

For further info, please see the article below: