I have a Samsung Galaxy A9 which I'm trying to connect to an external HDMI display by the means of a commonly-found USB-C to HDMI adapter like this one. Connecting the USB-C input "lights up" the adapter, and Android shows the adapter as charging, but it does not work with multiple HDMI cables and monitors.
After searching everywhere with no avail, I noticed that the notification area shows that adapter - briefly - connects and disconnects multiple times before it disconnects permanently (while still showing that the adapter is being charged).
Here the USB connector is shown connected (it disconnects soon afterwards, but I couldn't get a good shot of it) and charging.
Now the device has "disconnected" (I presume?) yet still charging.
I also tried forcing the phone to act as a host of the connection in the settings, but that also fails.
How can I enable USB OTG in my device (if it's not already enabled)? I take that the device should be able to do this screen sharing since it was produced in 2018, and I've seen older devices in videos performing it just as well. What can I do to fix this USB error and enable other things (such as a USB hub or a keyboard) to be used together with the phone?
Similar questions to this one are very old and not quite close, so that's why I'm asking again.
Many thanks, feedback is appreciated.