How to send an array of audio files as form/multipart-data?

Hello,

I am trying to connect to Elevan Labs - Add Voice api (docs here) for voice cloning. I've been trying to send the audio files like this:

A successful response is given by Eleven Labs but when I do a GET call (docs) to get the new voice's data, I see that no files were uploaded (see the "samples" array):

So you would say it is a Eleven Labs error, but the following is the response of a GET call of a voice created using the same Add Voice endpoint but through Postman, instead of Xano (you can see it did upload files to the "samples" array):

So Postman is creating voices correctly but Xano is not.

Any help would be appreciated. Thank you!