In the debugger in Xano, there isn't an option to upload multiple files at once, so you will need to use the Swagger documentation or a tool like Postman, which makes it even easier to test because you don't have to keep re-selecting your files each time.

Set the Body of your POST request to form-data and for the key of your array, you’ll add the array brackets [] to the name of your input, so in this example files[] and then you can upload various files (you have to add them all at the same time).