To upload a file trough the File Manager, do the following:
- Log in to cPanel
- Under Files click on File Manager.
- Choose root and show hidden files, and then click on go.
- Click to open the folder that you want to upload files to.
- Click on upload from the top toolbar.
- Click on browse (some web browsers needs to choose file instead)
- Choose the file on your computer the you want to upload.
- When you have choosen your file it will automatically be uploaded. You can choose more files while the uploading is ongoing.