String Variable - How to append values to self?

Hello,

probably a simple question, I want to append values to a local string variable but I'm not sure why my expression is not working:

If i remove the reference to the variable itself when attributing value then it sets the last value, not sure if there is a workaround or if its a limitation.

Maybe the JSON can't find your key.

If you want another easier way, you can have a text object then append text into it and set the variable equal text content.

Actually it is working as expected, turns out I was using a text object to display the result of the variable but the newline was making it go over the textobject height, causing it to not display.