Problem in modal form

Action::make('import')
->form([
FileUpload::make('upload'),
])
->action(function (array $data) {
Excel::import(new DistribusiFirstSheet, $data['upload']);
}),

I want to create a modal form with FileUpload in it, but when i submit the uploaded form i got error:
Illuminate \ Contracts \ Filesystem \ FileNotFoundException

What did I miss?