If you have Solid Explorer, you can now stream media to your Chromecast with a plugin they just released. Downloaded it yesterday, but I haven't had a chance to test it yet.
https://forums.androidcentral.com/e...tails?id=pl.solidexplorer.cast&token=dOXVxiuN
https://forums.androidcentral.com/e...tails?id=pl.solidexplorer.cast&token=dOXVxiuN