Exporting sound file

Ubuntu, latest MuseScore release. I can create a sound file, .ogg or .wav, but I want to export to facebook or youtube which do not support those formats. Have spent all day trying various approaches, but nthing seems to work. Any help gratefully received.

List of acceptable file types:
We recommend using the MP4 or MOV format, but here's a complete list of the video formats that can be uploaded to Facebook:

3g2 (Mobile Video)
3gp (Mobile Video)
3gpp (Mobile Video)
asf (Windows Media Video)
avi (AVI Video)
dat (MPEG Video)
divx (DIVX Video)
dv (DV Video)
f4v (Flash Video)
flv (Flash Video)
gif (Graphics Interchange Format)
m2ts (M2TS Video)
m4v (MPEG-4 Video)
mkv (Matroska Format)
mod (MOD Video)
mov (QuickTime Movie)
mp4 (MPEG-4 Video)
mpe (MPEG Video)
mpeg (MPEG Video)
mpeg4 (MPEG-4 Video)
mpg (MPEG Video)
mts (AVCHD Video)
nsv (Nullsoft Video)
ogm (Ogg Media Format)
ogv (Ogg Video Format)
qt (QuickTime Movie)
tod (TOD Video)
ts (MPEG Transport Stream)
vob (DVD Video)
wmv (Windows Media Video)

YOUTUBE

.MOV
.MPEG4
.MP4
.AVI
.WMV
.MPEGPS
.FLV
3GPP
WebM
DNxHR
ProRes
CineForm
HEVC (h265)