Question about Dell USB-C to

No, it doesn't work with my S8. But I must admit, that I did not try any specific app as Joepost07 suggested.

I use it with SAmsung S10. I'm sure it works provided the S8 has USB-C for charging

I have a Samsung Galaxy Note 8. Together with the Samsung Dex app, I can connect the Smartphone to a monitor via HDMI or DP.