fixed import export

app/Imports/Purchases/Bills.php

@@ -8,10 +8,12 @@ use App\Imports\Purchases\Sheets\BillItemTaxes;
 use App\Imports\Purchases\Sheets\BillHistories;
 use App\Imports\Purchases\Sheets\BillTotals;
 use App\Imports\Purchases\Sheets\BillTransactions;
+use Illuminate\Contracts\Queue\ShouldQueue;
 use Maatwebsite\Excel\Concerns\Importable;
+use Maatwebsite\Excel\Concerns\WithChunkReading;
 use Maatwebsite\Excel\Concerns\WithMultipleSheets;
 
-class Bills implements WithMultipleSheets
+class Bills implements ShouldQueue, WithChunkReading, WithMultipleSheets
 {
     use Importable;
 
@@ -26,4 +28,9 @@ class Bills implements WithMultipleSheets
             'bill_transactions' => new BillTransactions(),
         ];
     }
+
+    public function chunkSize(): int
+    {
+        return 100;
+    }
 }