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If you own a Meizu Pro 7 Plus phone that comes with its own unique USB Type-A based AC charger supporting USB Power Delivery, and are curious if the Meizu charger can work with another USB Power Delivery based phone like the ZTE Nubia Z17, we can confirm that this proprietary charger will negotiate over USB Power Delivery to charge the Nubia Z17. Note the Nubia Z17 supports Qualcomm Quick Charge 4+ which means it supports both USB Power Delivery 3.0 and Qualcomm Quick Charge 3.0.

This Meizu proprietary USB Type-A charger enables USB Power Delivery based communications using its own proprietary mCharge 4.0 technology to output 25 watts (5 volts @ 5 amps) to the Meizu Pro 7 Plus when connected with the Meizu's supplied USB Type-A to Type-C cable accessory, and 10 watts (5 volts @ 2 amps) to other phones or using other cables. 

Here we plug in this Meizu USB Type-A charger and connect it to the Nubia Z17 using the Meizu USB Type-A to Type-C cable and take a look at how they negotiate over USB Power Delivery using the GRL-USB-PD-A1 software by Granite River Labs.

Initially, the Meizu charger can be seen to offer 10 watts (5 volts @ 2 amps) and variable 4.98 to 9.96 watts (3-6 volts @ 1.66 amps) after a power reset over USB Power Delivery to the Nubia Z17.

The Nubia Z17 follows up to request an initial 10 watts (5 volts @ 2 amps) of charging from the Meizu charger which it accepts.

During negotiations, we also observe both charger and phone exchanging several Vendor Defined Messages including Discover Identity and SVIDs. 

At first plugin, the power graph shows that the Nubia Z17 starts pulling current around 1.5 amps @ 5.2 volts after requesting 10 watts (5 volts @ 2 amps) from the Meizu charger. As Vendor Defined Messages are exchanged, the current pulled drops down to 0.5 amps but quickly goes up to 2 amps while the voltage increases slightly to 5.3 volts. The current and voltage then eventually settle out for charging to happen at around 10 watts (5.3 volts @ 1.9 amps).

We can confirm that USB Power Delivery is working fine with the Meizu charger providing around 10 watts to the Nubia Z17 when connected directly using Meizu's owned USB Type-A to Type-C cable. However a higher charging power can be achieved when using the Nubia 17's own Qualcomm Quick Charge 3.0 charger.