diff --git a/localtypings/pxteditor.d.ts b/localtypings/pxteditor.d.ts
index 7ba3c537a68e..e71924644bb8 100644
--- a/localtypings/pxteditor.d.ts
+++ b/localtypings/pxteditor.d.ts
@@ -1296,6 +1296,14 @@ declare namespace pxt.editor {
 
     interface BaseAssetEditorResponse {
         id?: number;
+        /**
+         * indicate if operation started or completed successfully
+         */
+        success: boolean;
+        /**
+         * Error object if any
+         */
+        error?: any;
     }
 
     interface OpenAssetEditorResponse extends BaseAssetEditorResponse {
diff --git a/pxtservices/iframeDriver.ts b/pxtservices/iframeDriver.ts
index bef798c45622..f4fe919d6d2f 100644
--- a/pxtservices/iframeDriver.ts
+++ b/pxtservices/iframeDriver.ts
@@ -98,9 +98,9 @@ export abstract class IframeDriver {
     }
 
     protected resolvePendingMessage(event: MessageEvent) {
-        const data = event.data as pxt.editor.EditorMessageResponse;
-        if (data.id && this.pendingMessages[data.id]) {
-            const resp = event.data as pxt.editor.EditorMessageResponse;
+        const resp = event.data as pxt.editor.EditorMessageResponse | pxt.editor.AssetEditorResponse;
+
+        if (resp.id && this.pendingMessages[resp.id]) {
             const pending = this.pendingMessages[resp.id!];
             delete this.pendingMessages[resp.id!];
 
diff --git a/webapp/src/assetEditor.tsx b/webapp/src/assetEditor.tsx
index 6deb11e92326..e7b0d1fea35b 100644
--- a/webapp/src/assetEditor.tsx
+++ b/webapp/src/assetEditor.tsx
@@ -58,7 +58,8 @@ export class AssetEditor extends React.Component<{}, AssetEditorState> {
 
                 this.sendResponse({
                     id: request.id,
-                    type: request.type
+                    type: request.type,
+                    success: true
                 });
                 break;
             case "open":
@@ -73,7 +74,8 @@ export class AssetEditor extends React.Component<{}, AssetEditorState> {
                 });
                 this.sendResponse({
                     id: request.id,
-                    type: request.type
+                    type: request.type,
+                    success: true
                 });
                 break;
             case "duplicate":
@@ -85,14 +87,16 @@ export class AssetEditor extends React.Component<{}, AssetEditorState> {
                 });
                 this.sendResponse({
                     id: request.id,
-                    type: request.type
+                    type: request.type,
+                    success: true,
                 });
                 break;
             case "save":
                 this.sendResponse({
                     id: request.id,
                     type: request.type,
-                    files: this.saveProjectFiles()
+                    files: this.saveProjectFiles(),
+                    success: true
                 });
                 break;
         }