Function save_using_saver 

pub async fn save_using_saver<S: AssetSaver>(
    asset_server: AssetServer,
    saver: &S,
    path: &AssetPath<'_>,
    asset: SavedAsset<'_, '_, S::Asset>,
    settings: &S::Settings,
) -> Result<(), SaveAssetError>

Saves asset to path using the provided saver and settings.