If your hosting use cPanel:
- Login cPanel.
- Find Files section and select File Manager.
- Go to the domain folder it was created when you added the domain name to your hosting.
- Click Upload from the top toolbar to browser file from your device.
The source file will contain a lot of files and folders, so you need to zip them into one file to upload. After successfully uploading, you can extract it by selecting the file then click Extract from the toolbar.