diff --git a/android/ScratchJr/app/src/main/java/org/scratchjr/android/IOManager.java b/android/ScratchJr/app/src/main/java/org/scratchjr/android/IOManager.java
index 8f769cd..635d0ca 100644
--- a/android/ScratchJr/app/src/main/java/org/scratchjr/android/IOManager.java
+++ b/android/ScratchJr/app/src/main/java/org/scratchjr/android/IOManager.java
@@ -339,6 +339,11 @@ public class IOManager {
             if ("thumbnails".equals(folderName) || "sounds".equals(folderName)) {
                 continue;
             }
+            if (activity.libraryHasAsset(fileName)) {
+                Log.e(LOG_TAG, "asset for " + fileName + " exists in library");
+                // this is in library assets.
+                continue;
+            }
             String table = "characters".equals(folderName) ? "usershapes" : "userbkgs";
             String statement = String.format("SELECT id FROM %s WHERE md5 = ?", table);
             JSONArray rows = _databaseManager.query(statement, new String[]{fileName});
diff --git a/android/ScratchJr/app/src/main/java/org/scratchjr/android/JavaScriptDirectInterface.java b/android/ScratchJr/app/src/main/java/org/scratchjr/android/JavaScriptDirectInterface.java
index cf275b5..56cc90c 100644
--- a/android/ScratchJr/app/src/main/java/org/scratchjr/android/JavaScriptDirectInterface.java
+++ b/android/ScratchJr/app/src/main/java/org/scratchjr/android/JavaScriptDirectInterface.java
@@ -661,6 +661,11 @@ public class JavaScriptDirectInterface {
         }
     }
 
+    @JavascriptInterface
+    public void registerLibraryAssets(String assets) {
+        _activity.registerLibraryAssets(assets.split(","));
+    }
+
     @JavascriptInterface
     public void sendSjrUsingShareDialog(String fileName, String emailSubject,
                                         String emailBody, int shareType) {
diff --git a/android/ScratchJr/app/src/main/java/org/scratchjr/android/ScratchJrActivity.java b/android/ScratchJr/app/src/main/java/org/scratchjr/android/ScratchJrActivity.java
index 72a1285..59ce749 100644
--- a/android/ScratchJr/app/src/main/java/org/scratchjr/android/ScratchJrActivity.java
+++ b/android/ScratchJr/app/src/main/java/org/scratchjr/android/ScratchJrActivity.java
@@ -38,6 +38,7 @@ import com.google.firebase.analytics.FirebaseAnalytics;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashSet;
 import java.util.Vector;
 
 /**
@@ -112,6 +113,13 @@ public class ScratchJrActivity
      */
     private ArrayList<Uri> projectUris = new ArrayList<>();
 
+    /**
+     * This set will contain all the library assets.
+     * We are using set here so that we can find the asset
+     * whether in library in O(1) time.
+     */
+    private final HashSet<String> assetList = new HashSet<>(200);
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -657,4 +665,21 @@ public class ScratchJrActivity
                 }
             });
     }
+
+    /**
+     * We record all library assets names when app starts,
+     * so that we can know whether an asset should be marked
+     * as a user created one when importing.
+     * @param assets library asset md5
+     */
+    public void registerLibraryAssets(String[] assets) {
+        int length = assets.length;
+        for (int i = 0; i < length; i++) {
+            assetList.add(assets[i]);
+        }
+    }
+
+    public boolean libraryHasAsset(String md5) {
+        return assetList.contains(md5);
+    }
 }
diff --git a/ios/ScratchJr/src/IO.m b/ios/ScratchJr/src/IO.m
index 8536a5f..71cae34 100644
--- a/ios/ScratchJr/src/IO.m
+++ b/ios/ScratchJr/src/IO.m
@@ -342,6 +342,10 @@ NSMutableDictionary *soundtimers;
                 [fileManager copyItemAtPath:fromPath toPath:toPath error:nil];
             }
             
+            if ([ScratchJr libraryHasAsset:fileName]) {
+                continue;
+            }
+            
             NSArray *parts = [path componentsSeparatedByString:@"/"];
             if (parts.count > 1) {
                 NSString *folder = parts[1];
diff --git a/ios/ScratchJr/src/JsBridge.m b/ios/ScratchJr/src/JsBridge.m
index c6e66a9..f156ad2 100644
--- a/ios/ScratchJr/src/JsBridge.m
+++ b/ios/ScratchJr/src/JsBridge.m
@@ -207,4 +207,10 @@
     [request callback:[[UIDevice currentDevice] name]];
 }
 
+- (void) registerLibraryAssets: (JsRequest *) request {
+    NSString *assets = request.params[0];
+    [ScratchJr registerLibraryAssets: [assets componentsSeparatedByString:@","]];
+    [request callback:@"1"];
+}
+
 @end
diff --git a/ios/ScratchJr/src/ScratchJr.h b/ios/ScratchJr/src/ScratchJr.h
index 5a414af..fea87f5 100644
--- a/ios/ScratchJr/src/ScratchJr.h
+++ b/ios/ScratchJr/src/ScratchJr.h
@@ -170,4 +170,7 @@
 
 // Imports
 + (void) receiveProject:(NSURL *) url;
+
++ (void) registerLibraryAssets: (NSArray<NSString *> *)assets;
++ (BOOL) libraryHasAsset: (NSString *)md5;
 @end
diff --git a/ios/ScratchJr/src/ScratchJr.m b/ios/ScratchJr/src/ScratchJr.m
index 247f75e..ad79933 100644
--- a/ios/ScratchJr/src/ScratchJr.m
+++ b/ios/ScratchJr/src/ScratchJr.m
@@ -16,6 +16,8 @@ AVCaptureVideoPreviewLayer* captureVideoPreviewLayer;
 
 NSString *oncomplete;
 
+NSMutableSet *assets;
+
 //////////////////////////
 // Init functions
 /////////////////////////
@@ -169,4 +171,17 @@ NSString *oncomplete;
     cameraMask = nil;
 }
 
++ (void) registerLibraryAssets: (NSArray<NSString *> *)assetArr {
+    if (assets == nil) {
+        assets = [[NSMutableSet alloc] init];
+    }
+    for (NSString* md5 in assetArr) {
+        [assets addObject:md5];
+    }
+}
+
++ (BOOL) libraryHasAsset:(NSString *)md5 {
+    return [assets containsObject:md5];
+}
+
 @end
diff --git a/src/entry/app.js b/src/entry/app.js
index 2b4dabd..b3cfa69 100644
--- a/src/entry/app.js
+++ b/src/entry/app.js
@@ -41,7 +41,10 @@ window.onload = () => {
         preprocessAndLoadCss('css', 'css/thumbs.css');
         /* For parental gate. These CSS properties should be refactored */
         preprocessAndLoadCss('css', 'css/editor.css');
-        entryFunction = () => OS.waitForInterface(indexMain);
+        entryFunction = () => OS.waitForInterface(function () {
+            var assets = Object.keys(MediaLib.keys).join(',');
+            OS.registerLibraryAssets(assets, indexMain);
+        });
         break;
     case 'home':
         // Lobby pages
diff --git a/src/tablet/Android.js b/src/tablet/Android.js
index fd0eb5f..3d8e15d 100644
--- a/src/tablet/Android.js
+++ b/src/tablet/Android.js
@@ -254,6 +254,11 @@ export default class Android {
     //     return 1;
     // }
 
+    static registerLibraryAssets (assets, fcn) {
+        AndroidInterface.registerLibraryAssets(assets);
+        fcn && fcn();
+    }
+
     // Name of the device/iPad to display on the sharing dialog page
     // fcn is called with the device name as an arg
     static deviceName (fcn) {
diff --git a/src/tablet/OS.js b/src/tablet/OS.js
index 8cde8e0..d8242d4 100644
--- a/src/tablet/OS.js
+++ b/src/tablet/OS.js
@@ -247,6 +247,10 @@ export default class OS {
         return 1;
     }
 
+    static registerLibraryAssets (assets, fcn) {
+        tabletInterface.registerLibraryAssets(assets, fcn);
+    }
+
     // Name of the device/iPad to display on the sharing dialog page
     // fcn is called with the device name as an arg
     static deviceName (fcn) {
diff --git a/src/tablet/iOS.js b/src/tablet/iOS.js
index 8093987..0064be3 100644
--- a/src/tablet/iOS.js
+++ b/src/tablet/iOS.js
@@ -367,6 +367,13 @@ export default class iOS {
         iOS.call('sendSjrUsingShareDialog', fileName, emailSubject, emailBody, shareType);
     }
 
+    static registerLibraryAssets (assets, fcn) {
+        (async () => {
+            await iOS.call('registerLibraryAssets', assets);
+            fcn && fcn();
+        })();
+    }
+
     // Name of the device/iPad to display on the sharing dialog page
     // fcn is called with the device name as an arg
     static deviceName (fcn) {