Use the DS get app on Android to manage FTP tasks remotely. How to Use Download Station for FTP Downloads
In the app’s settings, you can limit the number of simultaneous connections per FTP server and cap the maximum download rate to preserve bandwidth. Important Limitations & Alternatives synology download station ftp client
While Download Station is excellent for downloading files, it has specific constraints: Using download station to download from a FTP server Use the DS get app on Android to manage FTP tasks remotely