Important: You can't enable two storages at the same time, if you enable FTP, amazon s3 will be automatically disabled, same for amazon s3.
Amazon S3 & FTP Settings
Configure Amazon S3
config->server == 'nodejs') { ?>
config->server == 'nodejs') ? "Note: If you are using node.js as messaging system, please restart your node.js (./nodejs/server.js) application after saving the changes." : '';?>
Digitalocean Spaces Configuration
FTP Settings
You can upload files directly from your server to another FTP server and load them from there.
Impotant: This may slow down your site's upload/delete speed, make sure to use fast FTP server.