no audiofile upload in create element. butt adobe's "Kling workflow guide" says it is possible.

In the adobe Kling guide (https://community.adobe.com/p/kling-quick-guide)

it says --" Create an Element by uploading up to four images, optionally adding an audio file for voice, …."--

But there is no option for audio files in the create element UI. 

There is also a limit to the @ references i can have in Kling 3.0 / omni . only 3 references to elements in the prompt including @image(1-2- ) 3 available boxes to add images as references . but then I have to remove one or else the generate button is greyed out.  

It is just very unclear what is the limit.