8241cc4cfa4a5af8f79b3d759016839a *gd70-01-02bt01.shn 95ccddf75b7330470b2ed666afd42ed8 *gd70-01-02bt02.shn 8f9b18559e6e252bdf5c75891a8f8976 *gd70-01-02bt03.shn 2a45d6e93631ad894ad17c3d4846b5d2 *gd70-01-02bt04.shn App\Http\Controllers\Api\ChecksumDownloadController::download(): Return value must be of type string, none returned