699b721190d6697b44856a28bf3f3b8d bt1996-07-04d3t01.shn 19d1f36937e03c2cab9101e3591f44ca bt1996-07-04d3t02.shn 807b4225707ae0a6fbba659daee70d86 bt1996-07-04d3t03.shn App\Http\Controllers\Api\ChecksumDownloadController::download(): Return value must be of type string, none returned