Switch Export Format to WebM (works for Overwatch 1 on Lutris; mixed for OW2):
In-game: Open settings (gear icon) > Video > Movie > Export Format > Set to WebM.
Relaunch and test saving a highlight.
Switch Export Format to WebM (works for Overwatch 1 on Lutris; mixed for OW2):
In-game: Open settings (gear icon) > Video > Movie > Export Format > Set to WebM.
Relaunch and test saving a highlight.