diff --git a/src/components/viewer/PsImage.ts b/src/components/viewer/PsImage.ts
index a2d9d420..2ff7ae2d 100644
--- a/src/components/viewer/PsImage.ts
+++ b/src/components/viewer/PsImage.ts
@@ -80,7 +80,7 @@ export default class ImageContentSetup {
   }
 
   zoomPanUpdate({ slide }: { slide: PsSlide }) {
-    if (!slide.data.highSrc || slide.data.highSrcCond !== 'zoom') return;
+    if (!slide.data.highSrc.length || slide.data.highSrcCond !== 'zoom') return;
 
     if (slide.currZoomLevel >= slide.zoomLevels.secondary) {
       this.loadFullImage(slide);
@@ -94,8 +94,8 @@ export default class ImageContentSetup {
     }
   }
 
-  loadFullImage(slide: PsSlide) {
-    if (!slide.data.highSrc) return;
+  async loadFullImage(slide: PsSlide) {
+    if (!slide.data.highSrc.length) return;
 
     // Get ximg element
     const img = slide.holderElement?.querySelector('.ximg:not(.ximg--full)') as HTMLImageElement;
@@ -110,17 +110,21 @@ export default class ImageContentSetup {
     this.loading++;
     this.lightbox.ui?.updatePreloaderVisibility();
 
-    fetchImage(slide.data.highSrc)
-      .then((blobSrc) => {
+    for (const src of slide.data.highSrc) {
+      try {
+        const blobSrc = await fetchImage(src);
+
         // Check if destroyed already
         if (!slide.content.element) return;
 
-        // Set src
         img.src = blobSrc;
-      })
-      .finally(() => {
-        this.loading--;
-        this.lightbox.ui?.updatePreloaderVisibility();
-      });
+        break; // success
+      } catch {
+        // go on to next image
+      }
+    }
+
+    this.loading--;
+    this.lightbox.ui?.updatePreloaderVisibility();
   }
 }
diff --git a/src/components/viewer/Viewer.vue b/src/components/viewer/Viewer.vue
index 324245f2..7717e558 100644
--- a/src/components/viewer/Viewer.vue
+++ b/src/components/viewer/Viewer.vue
@@ -803,17 +803,24 @@ export default defineComponent({
       this.loadMetadata(photo);
 
       // Get full image URL
-      const fullUrl = isvideo
-        ? null
-        : utils.isLocalPhoto(photo)
-        ? nativex.API.IMAGE_FULL(photo.fileid)
-        : API.IMAGE_DECODABLE(photo.fileid, photo.etag);
-      const fullLoadCond = this.config.high_res_cond || this.config.high_res_cond_default || 'zoom';
+      const highSrc: string[] = [];
+      if (!isvideo) {
+        // Try local file if NativeX is available
+        if (photo.auid && nativex.has()) {
+          highSrc.push(nativex.API.IMAGE_FULL(photo.auid));
+        }
+
+        // Decodable full resolution image
+        highSrc.push(API.IMAGE_DECODABLE(photo.fileid, photo.etag));
+      }
+
+      // Condition of loading full resolution image
+      const highSrcCond = this.config.high_res_cond || this.config.high_res_cond_default || 'zoom';
 
       return {
         src: previewUrl,
-        highSrc: fullUrl,
-        highSrcCond: fullLoadCond,
+        highSrc: highSrc,
+        highSrcCond: highSrcCond,
         width: w || undefined,
         height: h || undefined,
         thumbCropped: true,
diff --git a/src/components/viewer/types.ts b/src/components/viewer/types.ts
index 9b75fcea..f9983ddc 100644
--- a/src/components/viewer/types.ts
+++ b/src/components/viewer/types.ts
@@ -9,7 +9,7 @@ type PsAugment = {
     /** The original photo object. */
     photo: IPhoto;
     /** The source of the high resolution image. */
-    highSrc: string | null;
+    highSrc: string[];
     /** The condition for loading the high resolution image. */
     highSrcCond: IConfig['high_res_cond'];
     /** The type of content. */
diff --git a/src/native.ts b/src/native.ts
index b5b572f6..7f58a0f9 100644
--- a/src/native.ts
+++ b/src/native.ts
@@ -51,10 +51,10 @@ export const API = {
   /**
    * Local photo full API.
    * @regex ^/image/full/\d+$
-   * @param fileId File ID of the photo
+   * @param auid AUID of the photo
    * @returns {Blob} JPEG full image of the photo.
    */
-  IMAGE_FULL: (fileId: number) => `${BASE_URL}/image/full/${fileId}`,
+  IMAGE_FULL: (auid: number) => `${BASE_URL}/image/full/${auid}`,
 
   /**
    * Share a URL with native page.