diff --git a/app/Http/Controllers/Api/V1/QualityDocumentController.php b/app/Http/Controllers/Api/V1/QualityDocumentController.php
index 82cb42f..c0e9657 100644
--- a/app/Http/Controllers/Api/V1/QualityDocumentController.php
+++ b/app/Http/Controllers/Api/V1/QualityDocumentController.php
@@ -124,4 +124,24 @@ public function resultDocument(int $id)
             return $this->service->resultDocument($id);
         }, __('message.fetched'));
     }
+
+    public function uploadFile(Request $request, int $id)
+    {
+        $request->validate([
+            'file' => ['required', 'file', 'max:51200'], // 50MB
+        ]);
+
+        return ApiResponse::handle(function () use ($request, $id) {
+            return $this->service->uploadFile($id, $request->file('file'));
+        }, __('message.created'));
+    }
+
+    public function deleteFile(int $id)
+    {
+        return ApiResponse::handle(function () use ($id) {
+            $this->service->deleteFile($id);
+
+            return 'success';
+        }, __('message.deleted'));
+    }
 }
diff --git a/app/Models/Qualitys/QualityDocument.php b/app/Models/Qualitys/QualityDocument.php
index bcbc104..f5ba578 100644
--- a/app/Models/Qualitys/QualityDocument.php
+++ b/app/Models/Qualitys/QualityDocument.php
@@ -2,6 +2,7 @@
 
 namespace App\Models\Qualitys;
 
+use App\Models\Commons\File;
 use App\Models\Members\User;
 use App\Models\Orders\Client;
 use App\Traits\Auditable;
@@ -72,6 +73,12 @@ public function performanceReport()
         return $this->hasOne(PerformanceReport::class);
     }
 
+    public function file()
+    {
+        return $this->hasOne(File::class, 'document_id')
+            ->where('document_type', static::class);
+    }
+
     // ===== 채번 =====
 
     public static function generateDocNumber(int $tenantId): string
diff --git a/app/Services/QualityDocumentService.php b/app/Services/QualityDocumentService.php
index 2391b2f..e67a9ff 100644
--- a/app/Services/QualityDocumentService.php
+++ b/app/Services/QualityDocumentService.php
@@ -2,6 +2,7 @@
 
 namespace App\Services;
 
+use App\Models\Commons\File;
 use App\Models\Documents\Document;
 use App\Models\Documents\DocumentData;
 use App\Models\Documents\DocumentTemplate;
@@ -13,7 +14,9 @@
 use App\Models\Qualitys\QualityDocumentLocation;
 use App\Models\Qualitys\QualityDocumentOrder;
 use App\Services\Audit\AuditLogger;
+use Illuminate\Http\UploadedFile;
 use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Storage;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 
@@ -1248,4 +1251,78 @@ private function formatInspectionPeriod(array $options): string
 
         return $start ?: $end ?: '';
     }
+
+    // =========================================================================
+    // 파일 업로드/삭제
+    // =========================================================================
+
+    /**
+     * 품질관리서 파일 업로드 (1건당 1파일, 기존 파일 있으면 교체)
+     */
+    public function uploadFile(int $id, UploadedFile $uploadedFile): array
+    {
+        $tenantId = $this->tenantId();
+        $userId = $this->apiUserId();
+
+        $doc = QualityDocument::where('tenant_id', $tenantId)->findOrFail($id);
+
+        // 기존 파일이 있으면 물리 삭제 (교체)
+        $existingFile = $doc->file;
+        if ($existingFile) {
+            $existingFile->permanentDelete();
+        }
+
+        // 저장 경로: {tenant_id}/quality-documents/{year}/{month}/{stored_name}
+        $date = now();
+        $storedName = bin2hex(random_bytes(16)).'.'.$uploadedFile->getClientOriginalExtension();
+        $filePath = sprintf(
+            '%d/quality-documents/%s/%s/%s',
+            $tenantId,
+            $date->format('Y'),
+            $date->format('m'),
+            $storedName
+        );
+
+        // R2에 파일 저장
+        Storage::disk('r2')->put($filePath, file_get_contents($uploadedFile->getPathname()));
+
+        // DB 레코드 생성
+        $file = File::create([
+            'tenant_id' => $tenantId,
+            'document_type' => QualityDocument::class,
+            'document_id' => $doc->id,
+            'display_name' => $uploadedFile->getClientOriginalName(),
+            'stored_name' => $storedName,
+            'file_path' => $filePath,
+            'file_size' => $uploadedFile->getSize(),
+            'mime_type' => $uploadedFile->getClientMimeType(),
+            'uploaded_by' => $userId,
+            'created_by' => $userId,
+        ]);
+
+        return [
+            'id' => $file->id,
+            'display_name' => $file->display_name,
+            'file_size' => $file->file_size,
+            'mime_type' => $file->mime_type,
+            'created_at' => $file->created_at?->toIso8601String(),
+        ];
+    }
+
+    /**
+     * 품질관리서 파일 삭제
+     */
+    public function deleteFile(int $id): void
+    {
+        $tenantId = $this->tenantId();
+
+        $doc = QualityDocument::where('tenant_id', $tenantId)->findOrFail($id);
+
+        $file = $doc->file;
+        if (! $file) {
+            throw new NotFoundHttpException(__('error.not_found'));
+        }
+
+        $file->softDeleteFile($this->apiUserId());
+    }
 }
diff --git a/routes/api/v1/quality.php b/routes/api/v1/quality.php
index c09c5f1..0788b4e 100644
--- a/routes/api/v1/quality.php
+++ b/routes/api/v1/quality.php
@@ -29,6 +29,8 @@
     Route::post('/{id}/locations/{locId}/inspect', [QualityDocumentController::class, 'inspectLocation'])->whereNumber('id')->whereNumber('locId')->name('v1.quality.documents.inspect-location');
     Route::get('/{id}/request-document', [QualityDocumentController::class, 'requestDocument'])->whereNumber('id')->name('v1.quality.documents.request-document');
     Route::get('/{id}/result-document', [QualityDocumentController::class, 'resultDocument'])->whereNumber('id')->name('v1.quality.documents.result-document');
+    Route::post('/{id}/upload-file', [QualityDocumentController::class, 'uploadFile'])->whereNumber('id')->name('v1.quality.documents.upload-file');
+    Route::delete('/{id}/file', [QualityDocumentController::class, 'deleteFile'])->whereNumber('id')->name('v1.quality.documents.delete-file');
 });
 
 // 실적신고