Hi @fogo5.
Welcome to the community. A few questions to understand your question.
How would you expect the example you have provided to work? What functionality? How would it look (screenshot please).
Would you expect to be able to use the uploaded files in your Panel app? How?
Additional Context
There is already a Fileupload widget https://panel.holoviz.org/reference/widgets/FileInput.html. It works but could work better.
There is a discussion on how the existing FileInput can be styled and improved here What should a better FileInput look like?.