There are few options how to download data from your VPS or upload into your VPS.
Sending data in e-mail as an attachment (smaller files)
If you wish to upload or download data into or from your VPS then you can use your email via the web browser and send yourself such attachment. This will work with smaller files only.
Using shared drive
In the instance of larger files that cannot be sent via e-mail attachment, you can use in your browser GoogleDrive, MS OneDrive, Dropbox or other cloud storage which is accessible from your device as well as from AppOnFly VPS.