diff --git a/app/[locale]/products/[id]/customization-experience.tsx b/app/[locale]/products/[id]/customization-experience.tsx
index f3e48f73..6e20144f 100644
--- a/app/[locale]/products/[id]/customization-experience.tsx
+++ b/app/[locale]/products/[id]/customization-experience.tsx
@@ -180,7 +180,7 @@ function CustomizationExperienceInner({
     ProductCustomizationConfig.fromJson(customizationConfig);
   const resolvedCustomizationConfig =
     customizationConfig ?? ProductCustomizationConfig.default().toJson();
-  const isAllowsPhoto = customizationModel.allowPhotoDesign !== false;
+  const isAllowsPhoto = customizationModel.allowsPhoto();
   const customizableBaseImages = productImages.filter(
     (image) => image.purpose === ProductImagePurpose.CUSTOMIZABLE_BASE,
   );
diff --git a/app/[locale]/seller/products/product-form.tsx b/app/[locale]/seller/products/product-form.tsx
index d6490c22..ce2e2727 100644
--- a/app/[locale]/seller/products/product-form.tsx
+++ b/app/[locale]/seller/products/product-form.tsx
@@ -447,10 +447,16 @@ function buildTranslationMap(
 
 function buildPayload(locale: SupportedLocale, form: FormState) {
   const current = form.translations[locale];
+  const hasCustomizableBase = form.images.customizableBase.length > 0;
+  const effectiveMode =
+    hasCustomizableBase && form.customizationConfig?.mode === 'description'
+      ? 'text_photo'
+      : form.customizationConfig?.mode;
+
   const customizationConfig = form.customizationConfig
     ? {
         ...form.customizationConfig,
-        allowPhotoDesign: form.images.customizableBase.length > 0,
+        mode: effectiveMode,
       }
     : undefined;
   const currentDesignChangeDescription =
diff --git a/modules/cart/application/migrate-guest-cart.ts b/modules/cart/application/migrate-guest-cart.ts
index 2815084d..27e33eb2 100644
--- a/modules/cart/application/migrate-guest-cart.ts
+++ b/modules/cart/application/migrate-guest-cart.ts
@@ -435,17 +435,21 @@ async function resolveGuestCustomizationIds(
   const cached = createdCustomizationCache.get(cacheKey);
   if (cached) return [cached];
 
-  const created = await customizationCreator.create({
-    productId: g.productId,
-    text: g.customizationText ?? null,
-    color: g.customizationColor ?? null,
-    size: g.customizationSize ?? null,
-    imageUrl: g.customizationImageUrl ?? null,
-    designPosition: g.customizationDesignPosition ?? null,
-  });
-
-  createdCustomizationCache.set(cacheKey, created.id);
-  return [created.id];
+  try {
+    const created = await customizationCreator.create({
+      productId: g.productId,
+      text: g.customizationText ?? null,
+      color: g.customizationColor ?? null,
+      size: g.customizationSize ?? null,
+      imageUrl: g.customizationImageUrl ?? null,
+      designPosition: g.customizationDesignPosition ?? null,
+    });
+
+    createdCustomizationCache.set(cacheKey, created.id);
+    return [created.id];
+  } catch {
+    return null;
+  }
 }
 
 function guestCustomizationKey(g: GuestCartItem): string {
@@ -471,7 +475,10 @@ function isCustomizationAllowed(
     (g.customizationColor !== undefined && g.customizationColor !== null) ||
     (g.customizationSize !== undefined && g.customizationSize !== null);
   const hasPhoto =
-    g.customizationImageUrl !== undefined && g.customizationImageUrl !== null;
+    (g.customizationImageUrl !== undefined &&
+      g.customizationImageUrl !== null) ||
+    (g.customizationDesignPosition !== undefined &&
+      g.customizationDesignPosition !== null);
 
   if (hasPhoto && !capability.allowsPhoto()) return false;
   if (hasStyle && !capability.allowsStyleOptions()) return false;
diff --git a/modules/cart/presentation/components/add-to-cart-button.tsx b/modules/cart/presentation/components/add-to-cart-button.tsx
index c56e8940..3de08204 100644
--- a/modules/cart/presentation/components/add-to-cart-button.tsx
+++ b/modules/cart/presentation/components/add-to-cart-button.tsx
@@ -168,6 +168,7 @@ export function AddToCartButton({
 
   const [state, setState] = useState<ButtonState>('idle');
   const [cartItemInfo, setCartItemInfo] = useState<CartItemInfo | null>(null);
+  const [productInCart, setProductInCart] = useState(false);
   const [showCustomizationChoice, setShowCustomizationChoice] = useState(false);
   const [savingDesign, setSavingDesign] = useState(false);
 
@@ -203,6 +204,13 @@ export function AddToCartButton({
               normalizedCustomization,
             );
         setCartItemInfo(result.found);
+        setProductInCart(
+          !editCartItemId &&
+            result.found === null &&
+            (data.items ?? []).some(
+              (item: { productId: string }) => item.productId === productId,
+            ),
+        );
       } catch {
         /* fallback to "Add to Cart" */
       }
@@ -263,6 +271,12 @@ export function AddToCartButton({
         normalizedCustomization,
       );
       setCartItemInfo(result.found);
+      setProductInCart(
+        result.found === null &&
+          (data.items ?? []).some(
+            (item: { productId: string }) => item.productId === productId,
+          ),
+      );
     } catch {
       /* ignore */
     }
@@ -674,6 +688,25 @@ export function AddToCartButton({
     );
   }
 
+  // Product in cart with a different customization variant: show "Add another"
+  // button without quantity controls (this variant is not yet in the cart).
+  if (productInCart && isCustomizationHasContent && isAuthenticated) {
+    return (
+      <div className={styles.quantityRow}>
+        <button
+          type="button"
+          className={styles.saveButton}
+          onClick={handleAddAnother}
+          disabled={disabled || savingDesign || state === 'adding'}
+        >
+          {state === 'adding'
+            ? labels.adding
+            : labels.addAnotherPersonalization}
+        </button>
+      </div>
+    );
+  }
+
   // Default: "Add to Cart".
   return (
     <>
diff --git a/modules/cart/presentation/components/cart-merge-detector.tsx b/modules/cart/presentation/components/cart-merge-detector.tsx
index d1ba6695..11367cd0 100644
--- a/modules/cart/presentation/components/cart-merge-detector.tsx
+++ b/modules/cart/presentation/components/cart-merge-detector.tsx
@@ -61,13 +61,16 @@ export function CartMergeDetector({
                 strategy: 'merge',
               }),
             });
-            if (!res.ok) return;
+            if (!res.ok) {
+              hasCheckedRef.current = false;
+              return;
+            }
             // Clear guest cart after successful migration
             guestCart.clearCart();
             dispatchCartUpdated();
             router.refresh();
           } catch {
-            // Ignore - let user retry manually
+            hasCheckedRef.current = false;
           }
         }
       } catch {
diff --git a/modules/products/domain/value-objects/product-customization-config.ts b/modules/products/domain/value-objects/product-customization-config.ts
index b91766e3..689665dc 100644
--- a/modules/products/domain/value-objects/product-customization-config.ts
+++ b/modules/products/domain/value-objects/product-customization-config.ts
@@ -44,7 +44,6 @@ export interface ProductCustomizationConfigJson {
   previewTemplateUrl: string | null;
   textOffset: PreviewOffset | null;
   imageOffset: PreviewOffset | null;
-  allowPhotoDesign?: boolean;
   categoryId?: string | null;
 }
 
@@ -72,7 +71,6 @@ const productCustomizationConfigSchema = z
     previewTemplateUrl: z.string().min(1).nullable().optional(),
     textOffset: previewOffsetSchema.nullable().optional(),
     imageOffset: previewOffsetSchema.nullable().optional(),
-    allowPhotoDesign: z.boolean().optional(),
     categoryId: z.string().nullable().optional(),
   })
   .strip();
@@ -85,7 +83,6 @@ export class ProductCustomizationConfig {
       previewTemplateUrl: null,
       textOffset: null,
       imageOffset: null,
-      allowPhotoDesign: true,
       categoryId: null,
     });
   }
@@ -96,15 +93,26 @@ export class ProductCustomizationConfig {
       return this.default();
     }
 
-    const data = parsed.data;
+    const data = parsed.data as Record<string, unknown>;
+    const raw = value as Record<string, unknown> | null;
+
+    // Backward compat: stored JSON may have allowPhotoDesign: true with
+    // mode: 'description' from before the flag was removed.
+    const mode: CustomizationMode =
+      (data.mode as CustomizationMode) ?? 'description';
+    const effectiveMode: CustomizationMode =
+      mode === 'description' &&
+      (raw?.allowPhotoDesign as boolean | undefined) === true
+        ? 'text_photo'
+        : mode;
+
     return new ProductCustomizationConfig({
-      mode: data.mode ?? 'description',
-      previewEnabled: data.previewEnabled ?? false,
-      previewTemplateUrl: data.previewTemplateUrl ?? null,
-      textOffset: data.textOffset ?? null,
-      imageOffset: data.imageOffset ?? null,
-      allowPhotoDesign: data.allowPhotoDesign ?? true,
-      categoryId: data.categoryId ?? null,
+      mode: effectiveMode,
+      previewEnabled: (data.previewEnabled as boolean) ?? false,
+      previewTemplateUrl: (data.previewTemplateUrl as string | null) ?? null,
+      textOffset: (data.textOffset as PreviewOffset | null) ?? null,
+      imageOffset: (data.imageOffset as PreviewOffset | null) ?? null,
+      categoryId: (data.categoryId as string | null) ?? null,
     });
   }
 
@@ -113,7 +121,6 @@ export class ProductCustomizationConfig {
   readonly previewTemplateUrl: string | null;
   readonly textOffset: PreviewOffset | null;
   readonly imageOffset: PreviewOffset | null;
-  readonly allowPhotoDesign: boolean;
   readonly categoryId: string | null;
 
   private constructor(data: ProductCustomizationConfigJson) {
@@ -122,7 +129,6 @@ export class ProductCustomizationConfig {
     this.previewTemplateUrl = data.previewTemplateUrl;
     this.textOffset = data.textOffset;
     this.imageOffset = data.imageOffset;
-    this.allowPhotoDesign = data.allowPhotoDesign ?? true;
     this.categoryId = data.categoryId ?? null;
   }
 
@@ -166,7 +172,6 @@ export class ProductCustomizationConfig {
       previewTemplateUrl: this.previewTemplateUrl,
       textOffset: this.textOffset,
       imageOffset: this.imageOffset,
-      allowPhotoDesign: this.allowPhotoDesign,
       categoryId: this.categoryId,
     };
   }
diff --git a/modules/products/presentation/schemas/product-form-schema.ts b/modules/products/presentation/schemas/product-form-schema.ts
index a1dae034..d3877dcd 100644
--- a/modules/products/presentation/schemas/product-form-schema.ts
+++ b/modules/products/presentation/schemas/product-form-schema.ts
@@ -50,7 +50,6 @@ export const productCustomizationConfigSchema = z
     previewTemplateUrl: z.string().min(1).nullable(),
     textOffset: previewOffsetSchema.nullable(),
     imageOffset: previewOffsetSchema.nullable(),
-    allowPhotoDesign: z.boolean().optional(),
     categoryId: z.string().nullable().optional(),
   })
   .strip();
diff --git a/prisma/seed-data.ts b/prisma/seed-data.ts
index 187796a7..dece1136 100644
--- a/prisma/seed-data.ts
+++ b/prisma/seed-data.ts
@@ -167,7 +167,7 @@ export function buildSeedProducts(sellerId: string): SeedProductData[] {
       sellerId,
       status: 'ACTIVE',
       customizationConfig: {
-        mode: 'description',
+        mode: 'text_photo',
         previewEnabled: false,
         previewTemplateUrl: null,
         sizeOptions: null,
diff --git a/prisma/seed.ts b/prisma/seed.ts
index af50278f..6b30e0e5 100644
--- a/prisma/seed.ts
+++ b/prisma/seed.ts
@@ -560,6 +560,19 @@ async function main() {
   for (const [index, p] of productsData.entries()) {
     const { tags: tagSlugs, translations, ...productFields } = p;
     const category = categories[index % categories.length];
+    if (
+      !('customizationConfig' in p) &&
+      p.images?.create?.some((img) => img.purpose === 'CUSTOMIZABLE_BASE')
+    ) {
+      (productFields as Record<string, unknown>).customizationConfig = {
+        mode: 'text_photo',
+        previewEnabled: false,
+        previewTemplateUrl: null,
+        textOffset: null,
+        imageOffset: null,
+      };
+    }
+
     const product = await prisma.product.create({
       data: {
         ...productFields,
diff --git a/tests/e2e/personalization-flow.spec.ts b/tests/e2e/personalization-flow.spec.ts
index 41ca1bba..12a4255e 100644
--- a/tests/e2e/personalization-flow.spec.ts
+++ b/tests/e2e/personalization-flow.spec.ts
@@ -112,7 +112,7 @@ test.describe('Personalization flow', () => {
     const secondCustomizationCreation =
       waitForCustomizationCreation(customerPage);
     await customerPage
-      .getByRole('button', { name: 'Añadir al carrito' })
+      .getByRole('button', { name: 'Añadir otra personalización' })
       .click();
     const secondCustomizationResponse = await secondCustomizationCreation;
     expect(
diff --git a/tests/unit/app/[locale]/products/[id]/customization-experience.test.tsx b/tests/unit/app/[locale]/products/[id]/customization-experience.test.tsx
index 43f9dc85..9ee5a39e 100644
--- a/tests/unit/app/[locale]/products/[id]/customization-experience.test.tsx
+++ b/tests/unit/app/[locale]/products/[id]/customization-experience.test.tsx
@@ -223,7 +223,9 @@ describe('CustomizationExperience', () => {
             purpose: ProductImagePurpose.CUSTOMIZABLE_BASE,
           },
         ]}
-        customizationConfig={ProductCustomizationConfig.default().toJson()}
+        customizationConfig={ProductCustomizationConfig.fromJson({
+          mode: 'text_photo',
+        }).toJson()}
         labels={labels}
         initialDraft={{ color: 'Red' }}
       />,
@@ -261,7 +263,9 @@ describe('CustomizationExperience', () => {
             purpose: ProductImagePurpose.CUSTOMIZABLE_BASE,
           },
         ]}
-        customizationConfig={ProductCustomizationConfig.default().toJson()}
+        customizationConfig={ProductCustomizationConfig.fromJson({
+          mode: 'text_photo',
+        }).toJson()}
         labels={labels}
         initialDraft={{ color: 'Red' }}
       />,
diff --git a/tests/unit/modules/products/domain/value-objects/product-customization-config.test.ts b/tests/unit/modules/products/domain/value-objects/product-customization-config.test.ts
index 581d4f0c..25667ee4 100644
--- a/tests/unit/modules/products/domain/value-objects/product-customization-config.test.ts
+++ b/tests/unit/modules/products/domain/value-objects/product-customization-config.test.ts
@@ -10,7 +10,6 @@ describe('ProductCustomizationConfig', () => {
     expect(config.previewTemplateUrl).toBeNull();
     expect(config.textOffset).toBeNull();
     expect(config.imageOffset).toBeNull();
-    expect(config.allowPhotoDesign).toBe(true);
     expect(config.isDefault()).toBe(true);
     expect(config.isPreviewCapable()).toBe(false);
   });
diff --git a/tests/unit/modules/products/infrastructure/prisma-product-repository.test.ts b/tests/unit/modules/products/infrastructure/prisma-product-repository.test.ts
index b38e10ba..d156dae1 100644
--- a/tests/unit/modules/products/infrastructure/prisma-product-repository.test.ts
+++ b/tests/unit/modules/products/infrastructure/prisma-product-repository.test.ts
@@ -124,7 +124,6 @@ describe('PrismaProductRepository', () => {
           previewTemplateUrl: 'https://cdn.example.com/mock.png',
           textOffset: { x: 12, y: 20 },
           imageOffset: { x: 18, y: 30 },
-          allowPhotoDesign: true,
           categoryId: null,
         }),
         translations: {
@@ -244,7 +243,6 @@ describe('PrismaProductRepository', () => {
           previewTemplateUrl: 'https://cdn.example.com/mock.png',
           textOffset: { x: 12, y: 20 },
           imageOffset: { x: 18, y: 30 },
-          allowPhotoDesign: true,
           categoryId: null,
         }),
         updatedAt: product.updatedAt,