File writing help?

[Cepillado]

Hello, I'm trying to store some positions in a .txt file, but whenever I use the command to save the position, it writes over the same line and replaces the first position saved. Here's my code

function saveCoords(source) 
local x,y,z = getElementPosition( source ) 
local stringPos = string.format("%f, %f, %f \n ",x,y,z) 
local hFile = fileOpen("coords.txt",false)  
fileWrite(hFile,stringPos) 
fileClose(hFile) 
end 

I've tried the code without closing the file, same thing happens, I've also tried the code without the \n, and I get the same result. (I'm really sorry if you don't understand some of the things that I wrote, English is not my first language)

[IIYAMA]

function saveCoords(source) 
    local x,y,z = getElementPosition( source ) 
    local stringPos = string.format("%f, %f, %f \n ",x,y,z) 
    local hFile = fileOpen("coords.txt",false) 
fileSetPos(hFile,fileGetSize ( hFile )) -- I added this. 
    fileWrite(hFile,stringPos) 
    fileClose(hFile) 
  
    end 

You can get the filesize, which is the amount of bytes/characters in the document.

When you set the read position to the size of the document. It will start writing at the bytes after that.

Good luck!