How To Upload a File to Google Docs
Step 1 - Google Docs Upload Menu
The red button to the right of "CREATE" is the "UPLOAD" button. Click it, and choose "FILES" to initiate the upload.
Step 2 - Select File
Select the Folder that contains the file you want to upload. Select the actual file, in this case "Sample Excel". Click "OPEN".
Step 3 - Upload
Confirm personal upload preferences. Click the blue "UPLOAD" button.
Step 4 - Complete
You will now see your file on the Home Screen of Google Docs.