diff --git a/_articles/extended-usage/ocr.md b/_articles/extended-usage/ocr.md
index 6d9d6451..84c59fd5 100644
--- a/_articles/extended-usage/ocr.md
+++ b/_articles/extended-usage/ocr.md
@@ -480,5 +480,9 @@ The OCR add-on supports two kinds of searchable PDF output.
 
 OCR Basic and OCR Pro are previous OCR add-ons, which are deprecated in v16.2. But they are still usable in the latest version.
 
-To differentiate from previous versions, the new OCR uses `OCRKit` as the namespace.
+To differentiate from previous versions, the new OCR added since v19.3 uses `OCRKit` as the namespace.
+
+### Why I Cannot Load Saved PDF Files
+
+The searchable PDF saved has a text layer. You need to use [PDF Rasterizer](/_articles/info/api/Addon_PDF.md) to load it. A PDF Rasterizer license is required.
 
diff --git a/_articles/extended-usage/pdf-processing.md b/_articles/extended-usage/pdf-processing.md
index 1bd1ccf2..de9457cc 100644
--- a/_articles/extended-usage/pdf-processing.md
+++ b/_articles/extended-usage/pdf-processing.md
@@ -126,6 +126,9 @@ If you need to append a scanned document to a PDF file and keep the rest pages u
 DWTObject.Addon.PDF.SetReaderOptions({
   convertMode: Dynamsoft.DWT.EnumDWT_ConvertMode.CM_RENDERALL,
   preserveUnmodifiedOnSave: true, //only available for v19.0+
+  renderOptions:{
+    renderAnnotations: true //enable this to keep annotations
+  }
 });
 ```
 
diff --git a/_articles/info/api/Addon_Webcam.md b/_articles/info/api/Addon_Webcam.md
index 53374a8d..48e4af5a 100644
--- a/_articles/info/api/Addon_Webcam.md
+++ b/_articles/info/api/Addon_Webcam.md
@@ -11,6 +11,8 @@ description: Dynamic Web TWAIN SDK Documentation API Reference Webcam Addon APIs
 
 > {WebTwainObject} denotes the `WebTwain` instance.
 
+The Webcam add-on works on Windows desktop. If you need to scan documents with camera on other platforms (macOS, Linux and mobile) or perform document boundary detection and cropping, you can use [Mobile Document Scanner](https://www.dynamsoft.com/use-cases/mobile-document-scanner/).
+
 **Methods**
 
 | [`CaptureImage()`](#captureimage) | [`CloseSource()`](#closesource) | [`GetCameraControlPropertySetting()`](#getcameracontrolpropertysetting) | [`GetCameraControlPropertyMoreSetting()`](#getcameracontrolpropertymoresetting) |
diff --git a/_articles/introduction/index.md b/_articles/introduction/index.md
index 30d20701..6842e023 100644
--- a/_articles/introduction/index.md
+++ b/_articles/introduction/index.md
@@ -60,3 +60,7 @@ See [API reference](/_articles/info/api/index.md) where you can find more compre
 ## RESTful API
 
 Dynamic Web TWAIN also provides [RESTful API](https://www.dynamsoft.com/web-twain/restfulapi/) to access scanners using various programming languages. You can check out the [samples](https://www.dynamsoft.com/web-twain/docs/extended-usage/restful-api.html) and [APIs](https://www.dynamsoft.com/web-twain/docs/info/api/restful.html) to learn more.
+
+## Scan with Camera
+
+If you need to scan documents using your camera, with features like automatic border detection and cropping, try our other product: [Mobile Document Scanner](https://www.dynamsoft.com/use-cases/mobile-document-scanner/).