System sound on Thunderbird

Hello , it’s the first time I have this trouble when arrive the mail. I have 4 personal selection of sound; When I open TB. & I would like choice 1 sound in download!! It’s impossible for selection one of the four sound in download. because when arrive a mail directly I’m alert when arrive this mail! Today on budgie-ubuntu 20.04, please give me where are my four sound? normally every one are in download ! impossible for choice ?? thank you see you soon :upside_down_face:


Which version of Thunberbird ?

In which « package format » : .deb, snap or else ?

TB used to expect .wav files only here, see Comment personnaliser le son d'un nouveau mail | Assistance de Thunderbird