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PNG image are displayed with a black background
When sending, the background is transparent, but once synced, the background becomes black
Thumbnail generated by the homeserver have dark background... It seems that Riot-Web does not use thumbnail for the timeline. @dbkr or @bwindels could you confirm this please?
We don't, see https://github.com/matrix-org/matrix-react-sdk/blob/c547367b62e28d78dec8b9a1633502a198d32935/src/components/views/messages/MImageBody.js#L225