Ok, my bad.
I gave instructions for my 7.1.1 and bow that I look at my 8.1.1 it is not the same- and not the same as yours.
So, to compare apples to apples, there is a small, useful, ad-free, FOSS app you can use, called CPU Info.
CPU Info (Information about device hardware and software) -
https://f-droid.org/app/com.kgurgul.cpuinfo
This will give you the information that you need, and more.
The 'Hardware' section will look like this:
View attachment 149812
Notice where it says Charging Type and that it says AC.
AC is for standard and quick charging, and should provide plenty of juice to use the device and charge it at the same time.
If connected to a USB port, it would say USB- and that would be a slow charge- quite possibly not enough to use the device and gain an appreciable charge in a reasonable time, or even discharge while still charging.
A bad cord, however, can mimic the slow rate of charge from a USB port, even if plugged into a wall charger.