looking at th web site, the "new RemoteXY library version 3.1.6" for Arduino" dates back from June 4, 2021...
I had never heard of them and l given the lack of recent updates and/or community engagement, it is possible that the RemoteXY project is no longer actively maintained...
May be that's a sign you should not spend time there.
There is some activity movement.
In Aug 2024 I needed to upgrade the Library due to changes on the Webb editor.
This week I had to upgrade my phone app to make a new project work and to find out that the TEXT field is removed.
Do the same as what I have done with Remotexy.
1.Control a few relays and read the batt voltage .. not thru the Cloud but as a direct WiFi access point.
2.Same as above but thru the WiFi from any where.
I am busy with the Arduino Cloud for the last 2+ hours.
Getting started is very hard there is so many web pages with links to other pages and again links to more web pages.
I did manage to setup a cloud Thing ... but how do I download the code to my board???
Very simple 1 button with 1 led.
The code does compile in the Cloud editor.