diff --git a/backend/app/main.py b/backend/app/main.py
index d132cb7..fe90e8d 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -209,7 +209,7 @@ def send_completed_inspection_to_n8n(inspection, db):
         # No lanzamos excepción para no interrumpir el flujo normal
 
 
-BACKEND_VERSION = "1.0.93"
+BACKEND_VERSION = "1.0.94"
 app = FastAPI(title="Checklist Inteligente API", version=BACKEND_VERSION)
 
 # S3/MinIO configuration
diff --git a/backend/app/models.py b/backend/app/models.py
index 7d07411..6138ae0 100644
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -70,7 +70,8 @@ class Question(Base):
     points = Column(Integer, default=1)
     options = Column(JSON)  # Configuración flexible según tipo de pregunta
     order = Column(Integer, default=0)
-    allow_photos = Column(Boolean, default=True)
+    allow_photos = Column(Boolean, default=True)  # DEPRECATED: usar photo_requirement
+    photo_requirement = Column(String(20), default='optional')  # none, optional, required
     max_photos = Column(Integer, default=3)
     requires_comment_on_fail = Column(Boolean, default=False)
     send_notification = Column(Boolean, default=False)
diff --git a/frontend/package.json b/frontend/package.json
index 72f3d3a..e1f5e91 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "checklist-frontend",
   "private": true,
-  "version": "1.0.99",
+  "version": "1.1.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/frontend/public/service-worker.js b/frontend/public/service-worker.js
index a25bd54..e1fcd1e 100644
--- a/frontend/public/service-worker.js
+++ b/frontend/public/service-worker.js
@@ -1,6 +1,6 @@
 // Service Worker para PWA con detección de actualizaciones
 // IMPORTANTE: Actualizar esta versión cada vez que se despliegue una nueva versión
-const CACHE_NAME = 'ayutec-v1.0.99';
+const CACHE_NAME = 'ayutec-v1.1.0';
 const urlsToCache = [
   '/',
   '/index.html'
diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index 0e87f2d..f48bbd4 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1058,6 +1058,7 @@ function QuestionsManagerModal({ checklist, onClose }) {
       ]
     },
     allow_photos: true,
+    photo_requirement: 'optional',
     max_photos: 3,
     requires_comment_on_fail: false,
     send_notification: false,
@@ -1149,6 +1150,7 @@ function QuestionsManagerModal({ checklist, onClose }) {
             ]
           },
           allow_photos: true,
+          photo_requirement: 'optional',
           max_photos: 3,
           requires_comment_on_fail: false,
           send_notification: false,
@@ -1182,6 +1184,7 @@ function QuestionsManagerModal({ checklist, onClose }) {
         ]
       },
       allow_photos: question.allow_photos ?? true,
+      photo_requirement: question.photo_requirement || 'optional',
       max_photos: question.max_photos || 3,
       requires_comment_on_fail: question.requires_comment_on_fail || false,
       send_notification: question.send_notification || false,
@@ -1212,6 +1215,7 @@ function QuestionsManagerModal({ checklist, onClose }) {
           points: parseInt(formData.points),
           options: formData.options,
           allow_photos: formData.allow_photos,
+          photo_requirement: formData.photo_requirement,
           max_photos: parseInt(formData.max_photos),
           requires_comment_on_fail: formData.requires_comment_on_fail,
           send_notification: formData.send_notification,
@@ -1236,6 +1240,7 @@ function QuestionsManagerModal({ checklist, onClose }) {
             ]
           },
           allow_photos: true,
+          photo_requirement: 'optional',
           max_photos: 3,
           requires_comment_on_fail: false,
           send_notification: false,
@@ -1847,30 +1852,50 @@ function QuestionsManagerModal({ checklist, onClose }) {
                       className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500"
                     />
                   </div>
-                  <div className="flex items-center">
-                    <input
-                      type="checkbox"
-                      checked={formData.allow_photos}
-                      onChange={(e) => setFormData({ ...formData, allow_photos: e.target.checked })}
-                      className="w-4 h-4 text-purple-600 border-gray-300 rounded focus:ring-purple-500"
-                    />
-                    <label className="ml-2 text-sm text-gray-700">
-                      Permitir fotos
-                    </label>
-                  </div>
-                  <div>
-                    <label className="block text-sm font-medium text-gray-700 mb-1">
-                      Máx. fotos
-                    </label>
-                    <input
-                      type="number"
-                      min="0"
-                      max="10"
-                      value={formData.max_photos}
-                      onChange={(e) => setFormData({ ...formData, max_photos: parseInt(e.target.value) })}
-                      className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500"
-                      disabled={!formData.allow_photos}
-                    />
+                </div>
+
+                {/* Configuración de fotos/archivos */}
+                <div className="bg-indigo-50 border border-indigo-200 rounded-lg p-4">
+                  <h4 className="text-sm font-semibold text-indigo-900 mb-3">
+                    📷 Fotos y Archivos Adjuntos
+                  </h4>
+                  <div className="grid grid-cols-2 gap-4">
+                    <div>
+                      <label className="block text-sm font-medium text-gray-700 mb-2">
+                        Requisito de adjuntos
+                      </label>
+                      <select
+                        value={formData.photo_requirement || 'optional'}
+                        onChange={(e) => setFormData({ ...formData, photo_requirement: e.target.value })}
+                        className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500 bg-white"
+                      >
+                        <option value="none">🚫 No permitir adjuntos</option>
+                        <option value="optional">📎 Opcional (puede adjuntar si quiere)</option>
+                        <option value="required">⚠️ Obligatorio (debe adjuntar)</option>
+                      </select>
+                      <p className="text-xs text-gray-500 mt-1">
+                        {formData.photo_requirement === 'none' && '• No se podrán adjuntar fotos/archivos'}
+                        {formData.photo_requirement === 'optional' && '• El mecánico puede adjuntar si lo desea'}
+                        {formData.photo_requirement === 'required' && '• El mecánico DEBE adjuntar al menos 1 archivo'}
+                      </p>
+                    </div>
+                    <div>
+                      <label className="block text-sm font-medium text-gray-700 mb-2">
+                        Máx. archivos
+                      </label>
+                      <input
+                        type="number"
+                        min="1"
+                        max="10"
+                        value={formData.max_photos}
+                        onChange={(e) => setFormData({ ...formData, max_photos: parseInt(e.target.value) })}
+                        className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-purple-500"
+                        disabled={formData.photo_requirement === 'none'}
+                      />
+                      <p className="text-xs text-gray-500 mt-1">
+                        Cantidad máxima de fotos/PDFs permitidos
+                      </p>
+                    </div>
                   </div>
                 </div>
 
@@ -1992,7 +2017,15 @@ function QuestionsManagerModal({ checklist, onClose }) {
                                     {question.type}
                                   </span>
                                   <span>{question.points} pts</span>
-                                  {question.allow_photos && (
+                                  {question.photo_requirement === 'required' && (
+                                    <span className="px-2 py-1 bg-red-100 text-red-800 rounded text-xs">
+                                      ⚠️ Fotos obligatorias
+                                    </span>
+                                  )}
+                                  {question.photo_requirement === 'optional' && (
+                                    <span>📷 Máx {question.max_photos} fotos</span>
+                                  )}
+                                  {(!question.photo_requirement || question.allow_photos) && !question.photo_requirement && (
                                     <span>📷 Máx {question.max_photos} fotos</span>
                                   )}
                                   {question.send_notification && (
@@ -4396,12 +4429,20 @@ function InspectionModal({ checklist, existingInspection, user, onClose, onCompl
   const validateAllAnswered = () => {
     const visibleQuestions = getVisibleQuestions()
     const unanswered = visibleQuestions.filter(q => {
+      const answer = answers[q.id]
+      
       // Para preguntas tipo photo_only, solo validar que tenga fotos
       if (q.options?.type === 'photo_only') {
-        return !answers[q.id]?.photos?.length
+        return !answer?.photos?.length
       }
+      
+      // Validar fotos obligatorias (photo_requirement = 'required')
+      if (q.photo_requirement === 'required' && (!answer?.photos || answer.photos.length === 0)) {
+        return true  // Falta adjuntar fotos obligatorias
+      }
+      
       // Para otros tipos, validar que tenga respuesta
-      return !answers[q.id]?.value
+      return !answer?.value
     })
     return unanswered
   }
@@ -5088,13 +5129,23 @@ function InspectionModal({ checklist, existingInspection, user, onClose, onCompl
                 )}
 
                 {/* Photos */}
-                {currentQuestion.allow_photos && (
+                {(currentQuestion.photo_requirement !== 'none' || currentQuestion.allow_photos) && (
                   <div>
                     <label className="block text-sm font-medium text-gray-700 mb-2">
-                      Fotografías / Documentos *
+                      Fotografías / Documentos
+                      {currentQuestion.photo_requirement === 'required' && (
+                        <span className="ml-2 text-xs text-red-600 font-semibold">
+                          ⚠️ OBLIGATORIO
+                        </span>
+                      )}
+                      {currentQuestion.photo_requirement === 'optional' && (
+                        <span className="ml-2 text-xs text-gray-600">
+                          (opcional)
+                        </span>
+                      )}
                       {currentQuestion.max_photos && (
                         <span className="ml-2 text-xs text-gray-600">
-                          (máximo {currentQuestion.max_photos} archivo{currentQuestion.max_photos > 1 ? 's' : ''})
+                          - máx {currentQuestion.max_photos} archivo{currentQuestion.max_photos > 1 ? 's' : ''}
                         </span>
                       )}
                       {(checklist.ai_mode === 'assisted' || checklist.ai_mode === 'full') && (
@@ -5115,7 +5166,7 @@ function InspectionModal({ checklist, existingInspection, user, onClose, onCompl
                       }}
                       className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500"
                       disabled={aiAnalyzing}
-                      required={!answers[currentQuestion.id]?.photos?.length}
+                      required={currentQuestion.photo_requirement === 'required' && !answers[currentQuestion.id]?.photos?.length}
                     />
                     
                     {/* Photo Previews */}
diff --git a/migrations/change_allow_photos_to_photo_requirement.sql b/migrations/change_allow_photos_to_photo_requirement.sql
new file mode 100644
index 0000000..3da0b9d
--- /dev/null
+++ b/migrations/change_allow_photos_to_photo_requirement.sql
@@ -0,0 +1,22 @@
+-- Migración: Cambiar allow_photos de Boolean a String con 3 estados
+-- Fecha: 2025-12-02
+-- Descripción: Agregar soporte para fotos opcionales/obligatorias/no permitidas
+
+-- Paso 1: Agregar nueva columna
+ALTER TABLE questions ADD COLUMN photo_requirement VARCHAR(20) DEFAULT 'optional';
+
+-- Paso 2: Migrar datos existentes
+UPDATE questions 
+SET photo_requirement = CASE 
+    WHEN allow_photos = TRUE THEN 'optional'
+    WHEN allow_photos = FALSE THEN 'none'
+    ELSE 'optional'
+END;
+
+-- Paso 3: Eliminar columna antigua (opcional, comentar si quieres mantener compatibilidad)
+-- ALTER TABLE questions DROP COLUMN allow_photos;
+
+-- Nota: Los valores válidos son:
+-- 'none'       = No se permiten fotos
+-- 'optional'   = Fotos opcionales (puede adjuntar o no)
+-- 'required'   = Fotos obligatorias (debe adjuntar al menos 1)