Yes, generally multiple files are in an array:
<input type="file" name="files[]">
<input type="file" name="files[]">
<input type="file" name="files[]">
then validate the array in your form request
return [
'files.*' => 'mimes:jpeg,bmp,png', // or as required.
];
FYI, It calls the controller and as step one then calls the form request, if validation or access is true then continues down your code in the controller method otherwise returns the errors with redirect back().