diff --git a/libs/editor/WordPressEditor/src/main/java/org/wordpress/android/editor/GutenbergEditorFragment.java b/libs/editor/WordPressEditor/src/main/java/org/wordpress/android/editor/GutenbergEditorFragment.java
index d21984a2502b..c0c0755d2cb2 100644
--- a/libs/editor/WordPressEditor/src/main/java/org/wordpress/android/editor/GutenbergEditorFragment.java
+++ b/libs/editor/WordPressEditor/src/main/java/org/wordpress/android/editor/GutenbergEditorFragment.java
@@ -796,7 +796,7 @@ public void appendMediaFiles(Map<String, MediaFile> mediaList) {
 
         for (Map.Entry<String, MediaFile> mediaEntry : mediaList.entrySet()) {
             int mediaId = isNetworkUrl ? Integer.valueOf(mediaEntry.getValue().getMediaId())
-                    : mediaEntry.getValue().getId();
+                    : -mediaEntry.getValue().getId(); // negate local id here
             String url = isNetworkUrl ? mediaEntry.getKey() : "file://" + mediaEntry.getKey();
             rnMediaList.add(createRNMediaUsingMimeType(mediaId, url, mediaEntry.getValue().getMimeType()));
         }
diff --git a/libs/gutenberg-mobile b/libs/gutenberg-mobile
index 40171a1cf7f3..178e94cd3327 160000
--- a/libs/gutenberg-mobile
+++ b/libs/gutenberg-mobile
@@ -1 +1 @@
-Subproject commit 40171a1cf7f38685d7e625bbd3b6044b7484734c
+Subproject commit 178e94cd33279d5e3475fe11b5ad1b250d336abd