User Manual Samsung EE-M5100TBEGUS Dex Pad

As others have stated, It won't work with a thick case. However, I have a Unicorn Beetle kickstand case on my Galaxy S8+. I purchased a TUSITA USB-C Female to Male Extension Adapter on Amazon and it works perfectly. A USB-C extension cable will also work but the adapter I purchased is much smaller so your smartphone will still be able to lay on top of the DeX.

If you put your phone into developer mode, change USB settings, and then choose data transfer during your USB cable connection, it should work as a data transfer from phone to PC.

Yes! all your cell can do, you can watch at your big screen, just select mirror mode at DexPad options.