Won't charge via USB-C/USB-C via RavPower RP-PB059

[gu4rd1an]

I bought this powerbank mainly for the nintendo switch but it would be useful to charge my p10 plus as well, at least that was my idea.

Charging by using the standard USB-A ports on the powerbank would be not ideal (normal charge).
However, by using the USBC port it should trigger the PD and all the bells and whistles to activate the fast charge.

Now, this powerbank has a feature to make usb ports act as a passthrough, so long story short, the p10plus ask me if I want to charge only, going in mtp, midi ecc ecc (usual things).
Even if i choose the "charge only" option, it will stop charging after a second.

However, if I reboot the phone with the cable plugged into the powerbank it will get charge (fast mode) and it does not ask which mode I want to activate.

I've already tried playing around with developer options and whatever.
Any suggestions?

Thank you.

 

[Snapphane]

I read somewhere that some phones, the P10/P10 Plus included, wouldn't support USB-C charging on the RAV power bank. Might be this phone lack USB-C power delivery? Or something with how RAV has configured things? Maybe someone else has a proper answer.

Edit

It was an article on Android Authority - https://www.androidauthority.com/best-portable-chargers-409078/

"Worth noting is that the USB-C charging isn’t compatible with every device that comes with a USB-C port like the OnePlus 5, Huawei P10, and more /.../ "