Add the File Dropzone Converter element inside any container component to change it into a dropzone for file upload. Upload also works on click of the group component.
In order to use the uploaded files, you can link to the `files` state on the File Dropzone Converter, which is a list of 'file' things.
To limit the formats of files that can be uploaded use the `filetypes` field - as per the format for `accept` attribute (
https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/accept).
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