Solution
HP specs writes:
USB 3.1 Type-C™ Gen 1 (upt o 5 Gbit/s, DP1.2, HP Sleep and Charge)
Most likely it´s not a thunderbolt flash but a charge flash, so while the laptop is in sleep mode, the USB power on this port is on
Which laptop brand and model is it? Please post the complete model number which should be written on the bottom side of the laptop.

The flash besides the USB-C port should indicate that the port is Thunderbolt compatible. Depending on which GPU dock you wanna get, this should work.
 
Nov 29, 2018
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its a hp envy 17 and here is the product number: 2ps78ea#aBd

 
Nov 29, 2018
3
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thank you