Hi Ralf, thanks for your report.
The first - not working - way you describe should invoke `blueman-sendto` without any options. The second should invoke `blueman-sendto --source=<adapter_address> --device=<device_address>`. Could you try those two variants manually and see if the result is the same as through the applet and manager window? You can get the addresses from `bluetoothctl` (adapter is called Controller there). The crucial difference is probably the --device option, but I cannot spot the possible problem. When you confirmed that option makes the difference, please provide the output of blueman-sendto from start to the point where the error occurs. Regards
