diff --git a/JSDemos/Demos/FileManager/AzureClientBinding/React/App.tsx b/JSDemos/Demos/FileManager/AzureClientBinding/React/App.tsx
index 71b7bb9a759..c4871ba62ae 100644
--- a/JSDemos/Demos/FileManager/AzureClientBinding/React/App.tsx
+++ b/JSDemos/Demos/FileManager/AzureClientBinding/React/App.tsx
@@ -56,11 +56,13 @@ function App() {
       promise = Promise.resolve();
     }
 
-    promise = promise.then(() => gateway.putBlock( //
-      uploadInfo.customData.accessUrl,
-      uploadInfo.chunkIndex,
-      uploadInfo.chunkBlob,
-    ));
+    promise = promise.then(() => {
+      const accessUrl = uploadInfo.customData.accessUrl;
+      return gateway.putBlock(
+        accessUrl,
+        uploadInfo.chunkIndex,
+        uploadInfo.chunkBlob,
+      )});
 
     if (uploadInfo.chunkIndex === uploadInfo.chunkCount - 1) {
       promise = promise.then(() => gateway.putBlockList(
diff --git a/JSDemos/Demos/FileManager/AzureClientBinding/ReactJs/App.js b/JSDemos/Demos/FileManager/AzureClientBinding/ReactJs/App.js
index ed5d3d6039f..d3a422fe219 100644
--- a/JSDemos/Demos/FileManager/AzureClientBinding/ReactJs/App.js
+++ b/JSDemos/Demos/FileManager/AzureClientBinding/ReactJs/App.js
@@ -52,13 +52,10 @@ function App() {
     } else {
       promise = Promise.resolve();
     }
-    promise = promise.then(() =>
-      gateway.putBlock(
-        //
-        uploadInfo.customData.accessUrl,
-        uploadInfo.chunkIndex,
-        uploadInfo.chunkBlob,
-      ));
+    promise = promise.then(() => {
+      const accessUrl = uploadInfo.customData.accessUrl;
+      return gateway.putBlock(accessUrl, uploadInfo.chunkIndex, uploadInfo.chunkBlob);
+    });
     if (uploadInfo.chunkIndex === uploadInfo.chunkCount - 1) {
       promise = promise.then(() =>
         gateway.putBlockList(uploadInfo.customData.accessUrl, uploadInfo.chunkCount));