fileUpload inside Action Modal

I'm creating an action where User is able to send emails.

On email form action I create a new action where I want to open a modal where user can manage Attachments, currently I'm using FileUpload, but I'm not achieving to get the file after upload and not make it so that when it returns to this modal it already presents the selected files.

Do you have any idea in hot to do this without creating a custom component view ?
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