The other reviewer wasn't kidding that you need to find the correct 'alignment' for the USB-C cables for this to work; I was just about to give up hope and conclude that this device wasn't going to work with an iPhone and then all of a sudden found the right combination of cable alignments and it sprung into life.
I paid an absolutely outrageous price of $35.00 international shipping on a $9.00 order that still took two weeks to arrive from the US to UK, but I've not been able to find anything else that passes through USB PD so reluctantly paid the price.
Response from Essence Engineering | Nov. 27, 2023
Always appreciate feedback. Glad you got it working! As I noted in the description, not all USB cables are built the same so testing with different orientations of cables you have on hand is often necessary. A note about international shipping prices (from US): Definitely sucks that I can't do Amazon style cheap shipping for all the DIYers out there but I only list what usps charges with minimum adder to cover shipping material.