diff --git a/File-Formats-toc.html b/File-Formats-toc.html
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@@ -742,6 +742,24 @@
 			</li>
 				</ul>
 				</li>
+				<li><a href="/file-formats/pdf/Open-and-Save-PDF-file-in-C-Sharp-VB-NET">Open PDF files</a>
+				<ul>
+					<li><a href="/file-formats/pdf/Open-pdf-files/From-google-drive">From Google Drive</a></li>
+					<li><a href="/file-formats/pdf/Open-pdf-files/From-dropbox-cloud-file-storage">From Dropbox cloud file storage</a></li>
+					<li><a href="/file-formats/pdf/Open-pdf-files/From-azure-blob-storage">From Azure blob storage</a></li>
+					<li><a href="/file-formats/pdf/Open-pdf-files/From-google-cloud-storage">From Google Cloud storage</a></li>
+					<li><a href="/file-formats/pdf/Open-pdf-files/From-AWS-S3">From AWS S3</a></li>
+				</ul>
+				</li>
+				<li><a href="/file-formats/pdf/Open-and-Save-PDF-file-in-C-Sharp-VB-NET">Save PDF files</a>
+				<ul>
+					<li><a href="/file-formats/pdf/Save-pdf-files/To-google-drive">To Google Drive</a></li>
+					<li><a href="/file-formats/pdf/Save-pdf-files/To-dropbox-cloud-file-storage">To Dropbox cloud file storage</a></li>
+					<li><a href="/file-formats/pdf/Save-pdf-files/To-azure-blob-storage">To Azure blob storage</a></li>
+					<li><a href="/file-formats/pdf/Save-pdf-files/To-google-cloud-storage">To Google Cloud storage</a></li>
+					<li><a href="/file-formats/pdf/Save-pdf-files/To-AWS-S3">To AWS S3</a></li>
+				</ul>
+				</li>
             <li><a href="/file-formats/pdf/working-with-document">Working with Document</a></li>
             <li><a href="/file-formats/pdf/working-with-pages">Working with Pages</a></li>
             <li><a href="/file-formats/pdf/working-with-text">Working with Text</a></li>