Thanks for that. The longer-term goal is to make a "dock" for my elderly mom's phone that lets her use it as a tiny (her eyes are still good) pseudo-desktop setup with keyboard and mouse. She often ends up with her phone as her only communications device when things go wrong (again) on her laptop and this would give a good email experience (she's a skilled touch-typist). Any pointers to a cheap USB-C dock on Ali that does the job?
Sadly, one limitation, at least on the Android device, is that you can't use it in landscape mode with a mouse. Well, you can, but the launcher only operates in portrait mode, as do a lot of apps. I don't want to change the launcher - elderly folks get very fixated on how their device is supposed to work. Anyway as soon as the phone switches to sideways-portrait mode, the mouse also does which is very disorienting.
Nothing I've tested specifically with Android--my use has been mostly Steam Deck or iPad Pro.
I've had good luck with the Anker stuff. Not sure if any of it's on Aliexpress, but they are on Amazon. I have a couple of the Anker 555 which is about $50. The Anker 332 looks fairly similar for more like $20. Both have the "PD-IN".
I'm, again, not sure how it would interact with Android, but basically all of these have a HDMI port as well. It might be worth a try to see how Android handles the portrait/landscape stuff with an external display--connecting it to a cheap monitor might resolve some of that for you. I have some fuzzy recollection of doing this back in the day with a MHL adapter and the phone displaying portrait the right way up just with black space on the left and right on the screen.
Anker 332 with a charger connected, mouse and keyboard plugged in, and HDMI running to an external monitor might get you essentially a "desktop" experience with a single cable. If her laptop has a USB-C port as well, when that's working she may be able to just plug that in to make use of all the peripherals on that instead. Something like the 555 also has a SD card reader which could work as some shared storage for moving files between the devices just by plugging them in and saving them there.
Sadly, one limitation, at least on the Android device, is that you can't use it in landscape mode with a mouse. Well, you can, but the launcher only operates in portrait mode, as do a lot of apps. I don't want to change the launcher - elderly folks get very fixated on how their device is supposed to work. Anyway as soon as the phone switches to sideways-portrait mode, the mouse also does which is very disorienting.