Configurable cover art filename for upload

[Hufsa]

It would be nice if one could choose the filename of cover art uploaded via the web-UI. Now it seems files automatically get the name "cover.jpg". But since I also use Sonos, these images are not shown in the Sonos controller because Sonos only shows files named "folder.jpg" (https://sonos.custhelp.com/app/answers/ ... -and-sonos).
Or is there maybe a setting hidden somewhere which I'm missing?