To edit an HTML file in your course, you will need to download your previously uploaded HTML file to your computer, edit and save your HTML file, and then upload your HTML file again.
Download HTML File
Click the line item for the file . Click the Download icon . Or click the Settings icon  and then click the Download link .
Open HTML File
Your file will download to your desktop. Open the appropriate folder to view the file.
Note: The file may be saved to the Downloads folder on your computer.
Edit HTML File
After you open the HTML file, edit the file using a text or HTML editor on your computer. Save the file.
Upload HTML File
In Files, click the Upload button.