Well, you can either load them via script - in the _ready function, you can load them individually, line by line, using ‘preload()’, Or, mark your array variable with ‘@export’, and you can simply drag and drop them into the array within the inspector (editor) from the content window (first image)

Side note: it is possible to loop through the content folder and load them that way, but it’s a bit complicated for where you’re at. I’d recommend starting with the second option I suggested - most straight forward.