You can easily upload files to your site using an option File Manager in cPanel. The steps to be followed are:
1. Log in to CPanel.
2. Click on ‘File Manager’ under Files.
3. Select ‘Document root’ from the File Manager directory selection window.
4. Click on ‘Upload’ to upload files from your local system.
5. Click on ‘Browse’ to select files.( You can increase the no:of files by clicking ‘Add another upload box’).
6. Click on ‘Back to /home/…/public_html’ after uploading completes.
In the list of files under public_html folder, you can see the uploaded files.