const DOCUMENT_FORMS = {
  "pay_application": PayApplicationForm,
  "invoice": InvoiceForm,
  ...
}

const DocumentViewer = (props) => {
  const { document } = props;

  const DocumentForm = DOCUMENT_FORMS[document.type];

  const fileViewHeader = (
    <Pane padding={16} display="flex" justifyContent="space-between">
      <Pane>
        <Text size={600}>Boulding Creek Draw 7 Uploads</Text>
      </Pane>

      <Pane>
        <Button>Next</Button>
        ...
      </Pane>
    </Pane>
  );

  const fileViewSidebar = (
    ...
  );

  return (
    <FileViewer
      header={fileViewHeader}
      sidebar={fileViewSidebar}
      previewFileUrl={document.file.url}
      previewFileType={document.file.type}
    >
      <DocumentForm {...props} />
    </FileViewer>
  )
};