Ok, so I assume this function attaches a single character to a string,
StringConcatSingleChar(buffer,char)

I say I assume because I can't find any documentation on it.

In my various attempts to use it, I get an error that I'm not using the correct variable type. I use a string and a character.

I came up with a different way to do it: using a character array with one character making it a string and concatanating that to the other string I want, but its messy.. I'd rather use StringConcatSingleChar() if it works.

Can you give me a working example, or show me where it's documented?

Just wanted to let you know that this is a known issue and will be fixed in an upcoming patch. We will also be updating our documentation as we go. We will let you know when said patch is out. Thank you!