diff --git a/data/core.telegram.org/js/main.js b/data/core.telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/core.telegram.org/js/main.js
+++ b/data/core.telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;
diff --git a/data/corefork.telegram.org/js/main.js b/data/corefork.telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/corefork.telegram.org/js/main.js
+++ b/data/corefork.telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;
diff --git a/data/desktop.telegram.org/js/main.js b/data/desktop.telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/desktop.telegram.org/js/main.js
+++ b/data/desktop.telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;
diff --git a/data/instantview.telegram.org/js/main.js b/data/instantview.telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/instantview.telegram.org/js/main.js
+++ b/data/instantview.telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;
diff --git a/data/macos.telegram.org/js/main.js b/data/macos.telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/macos.telegram.org/js/main.js
+++ b/data/macos.telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;
diff --git a/data/promote.telegram.org.html b/data/promote.telegram.org.html
index 0553cbe103..16703e6df2 100644
--- a/data/promote.telegram.org.html
+++ b/data/promote.telegram.org.html
@@ -103,13 +103,13 @@
     <script src="/js/bootstrap.min.js"></script>
     <script src="/js/main-aj.js?56"></script>
     <script src="/js/widget-frame.js?56"></script>
-<script src="/js/promote.js?47"></script>
+<script src="/js/promote.js?48"></script>
 <script src="/js/jquery-ui.min.js?1"></script>
 <script src="/js/jquery-ex.js?6"></script>
 <script src="/js/tchart.min.js?18"></script>
 <script src="/js/health.js?16"></script>
 
-    <script>ajInit({"version":540,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
+    <script>ajInit({"version":541,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
     <script id="aj_script">l.add({"WEB_AB_WARNING_HEADER":"Turn off ad blocker","WEB_POPUP_CLOSE_BTN":"Close","WEB_AB_WARNING_TEXT":"You appear to be using an ad blocker that may prevent pages on the Telegram Ad Platform from working as expected.<br\/><br\/>Please turn off your ad blocker or add <a href=\"http:\/\/promote.telegram.org\/\">promote.telegram.org<\/a> as an exception to manage your promoted messages."});
 window.enableInlineVideo&&$('video').each(function(){enableInlineVideo(this)});
 Ads.init();
diff --git a/data/promote.telegram.org/auth.html b/data/promote.telegram.org/auth.html
index 893e37e65e..c53cfff531 100644
--- a/data/promote.telegram.org/auth.html
+++ b/data/promote.telegram.org/auth.html
@@ -103,13 +103,13 @@
     <script src="/js/bootstrap.min.js"></script>
     <script src="/js/main-aj.js?56"></script>
     <script src="/js/widget-frame.js?56"></script>
-<script src="/js/promote.js?47"></script>
+<script src="/js/promote.js?48"></script>
 <script src="/js/jquery-ui.min.js?1"></script>
 <script src="/js/jquery-ex.js?6"></script>
 <script src="/js/tchart.min.js?18"></script>
 <script src="/js/health.js?16"></script>
 
-    <script>ajInit({"version":540,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
+    <script>ajInit({"version":541,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
     <script id="aj_script">l.add({"WEB_AB_WARNING_HEADER":"Turn off ad blocker","WEB_POPUP_CLOSE_BTN":"Close","WEB_AB_WARNING_TEXT":"You appear to be using an ad blocker that may prevent pages on the Telegram Ad Platform from working as expected.<br\/><br\/>Please turn off your ad blocker or add <a href=\"http:\/\/promote.telegram.org\/\">promote.telegram.org<\/a> as an exception to manage your promoted messages."});
 openPopup('#login-popup-container');
 window.enableInlineVideo&&$('video').each(function(){enableInlineVideo(this)});
diff --git a/data/promote.telegram.org/basics.html b/data/promote.telegram.org/basics.html
index 0553cbe103..16703e6df2 100644
--- a/data/promote.telegram.org/basics.html
+++ b/data/promote.telegram.org/basics.html
@@ -103,13 +103,13 @@
     <script src="/js/bootstrap.min.js"></script>
     <script src="/js/main-aj.js?56"></script>
     <script src="/js/widget-frame.js?56"></script>
-<script src="/js/promote.js?47"></script>
+<script src="/js/promote.js?48"></script>
 <script src="/js/jquery-ui.min.js?1"></script>
 <script src="/js/jquery-ex.js?6"></script>
 <script src="/js/tchart.min.js?18"></script>
 <script src="/js/health.js?16"></script>
 
-    <script>ajInit({"version":540,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
+    <script>ajInit({"version":541,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
     <script id="aj_script">l.add({"WEB_AB_WARNING_HEADER":"Turn off ad blocker","WEB_POPUP_CLOSE_BTN":"Close","WEB_AB_WARNING_TEXT":"You appear to be using an ad blocker that may prevent pages on the Telegram Ad Platform from working as expected.<br\/><br\/>Please turn off your ad blocker or add <a href=\"http:\/\/promote.telegram.org\/\">promote.telegram.org<\/a> as an exception to manage your promoted messages."});
 window.enableInlineVideo&&$('video').each(function(){enableInlineVideo(this)});
 Ads.init();
diff --git a/data/promote.telegram.org/getting-started.html b/data/promote.telegram.org/getting-started.html
index d80705de30..ebfe8de436 100644
--- a/data/promote.telegram.org/getting-started.html
+++ b/data/promote.telegram.org/getting-started.html
@@ -219,13 +219,13 @@
     <script src="/js/bootstrap.min.js"></script>
     <script src="/js/main-aj.js?56"></script>
     <script src="/js/widget-frame.js?56"></script>
-<script src="/js/promote.js?47"></script>
+<script src="/js/promote.js?48"></script>
 <script src="/js/jquery-ui.min.js?1"></script>
 <script src="/js/jquery-ex.js?6"></script>
 <script src="/js/tchart.min.js?18"></script>
 <script src="/js/health.js?16"></script>
 
-    <script>ajInit({"version":540,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
+    <script>ajInit({"version":541,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
     <script id="aj_script">l.add({"WEB_AB_WARNING_HEADER":"Turn off ad blocker","WEB_POPUP_CLOSE_BTN":"Close","WEB_AB_WARNING_TEXT":"You appear to be using an ad blocker that may prevent pages on the Telegram Ad Platform from working as expected.<br\/><br\/>Please turn off your ad blocker or add <a href=\"http:\/\/promote.telegram.org\/\">promote.telegram.org<\/a> as an exception to manage your promoted messages."});
 window.enableInlineVideo&&$('video').each(function(){enableInlineVideo(this)});
 Ads.init();
diff --git a/data/promote.telegram.org/guidelines.html b/data/promote.telegram.org/guidelines.html
index 8be3d08857..174b91d7a5 100644
--- a/data/promote.telegram.org/guidelines.html
+++ b/data/promote.telegram.org/guidelines.html
@@ -211,13 +211,13 @@
     <script src="/js/bootstrap.min.js"></script>
     <script src="/js/main-aj.js?56"></script>
     <script src="/js/widget-frame.js?56"></script>
-<script src="/js/promote.js?47"></script>
+<script src="/js/promote.js?48"></script>
 <script src="/js/jquery-ui.min.js?1"></script>
 <script src="/js/jquery-ex.js?6"></script>
 <script src="/js/tchart.min.js?18"></script>
 <script src="/js/health.js?16"></script>
 
-    <script>ajInit({"version":540,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
+    <script>ajInit({"version":541,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
     <script id="aj_script">l.add({"WEB_AB_WARNING_HEADER":"Turn off ad blocker","WEB_POPUP_CLOSE_BTN":"Close","WEB_AB_WARNING_TEXT":"You appear to be using an ad blocker that may prevent pages on the Telegram Ad Platform from working as expected.<br\/><br\/>Please turn off your ad blocker or add <a href=\"http:\/\/promote.telegram.org\/\">promote.telegram.org<\/a> as an exception to manage your promoted messages."});
 window.enableInlineVideo&&$('video').each(function(){enableInlineVideo(this)});
 Ads.init();
diff --git a/data/promote.telegram.org/js/promote.js b/data/promote.telegram.org/js/promote.js
index e15226a54b..dc8bb463d0 100644
--- a/data/promote.telegram.org/js/promote.js
+++ b/data/promote.telegram.org/js/promote.js
@@ -629,7 +629,7 @@ var NewAd = {
     var message = null;
     var curPreviewFormData = NewAd.getPreviewFormData();
     if (Aj.state.initPreviewFormData != curPreviewFormData) {
-      message = l('WEB_LEAVE_PAGE_CONFIRM_TEXT');
+      message = l('WEB_LEAVE_FORM_CONFIRM_TEXT');
     }
     if (message) {
       var message_html = $('<div>').text(message).html();
@@ -681,7 +681,6 @@ var NewAd = {
     var $submitBtn = $('.submit-form-btn', $previewPopup);
     $submitBtn.on('click', previewSave);
     var previewCancel = function() {
-      state.initPreviewFormData = NewAd.getPreviewFormData();
       closePopup($previewPopup);
     }
     var $cancelBtn = $('.cancel-form-btn', $previewPopup);
@@ -700,6 +699,7 @@ var NewAd = {
       $submitBtn.off('click', previewSave);
       $cancelBtn.off('click', previewCancel);
       $previewPopup.remove();
+      state.initPreviewFormData = NewAd.getPreviewFormData();
     });
     openPopup($previewPopup, {
       closeByClickOutside: '.popup-no-close',
diff --git a/data/promote.telegram.org/tos.html b/data/promote.telegram.org/tos.html
index 530664241c..7344f08730 100644
--- a/data/promote.telegram.org/tos.html
+++ b/data/promote.telegram.org/tos.html
@@ -151,13 +151,13 @@
     <script src="/js/bootstrap.min.js"></script>
     <script src="/js/main-aj.js?56"></script>
     <script src="/js/widget-frame.js?56"></script>
-<script src="/js/promote.js?47"></script>
+<script src="/js/promote.js?48"></script>
 <script src="/js/jquery-ui.min.js?1"></script>
 <script src="/js/jquery-ex.js?6"></script>
 <script src="/js/tchart.min.js?18"></script>
 <script src="/js/health.js?16"></script>
 
-    <script>ajInit({"version":540,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
+    <script>ajInit({"version":541,"apiUrl":"\/api?hash=telegram-crawler","unauth":true});</script>
     <script id="aj_script">l.add({"WEB_AB_WARNING_HEADER":"Turn off ad blocker","WEB_POPUP_CLOSE_BTN":"Close","WEB_AB_WARNING_TEXT":"You appear to be using an ad blocker that may prevent pages on the Telegram Ad Platform from working as expected.<br\/><br\/>Please turn off your ad blocker or add <a href=\"http:\/\/promote.telegram.org\/\">promote.telegram.org<\/a> as an exception to manage your promoted messages."});
 window.enableInlineVideo&&$('video').each(function(){enableInlineVideo(this)});
 Ads.init();
diff --git a/data/telegram.org/js/main.js b/data/telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/telegram.org/js/main.js
+++ b/data/telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;
diff --git a/data/tsf.telegram.org/js/main.js b/data/tsf.telegram.org/js/main.js
index 898af98e24..6ce98d7dfc 100644
--- a/data/tsf.telegram.org/js/main.js
+++ b/data/tsf.telegram.org/js/main.js
@@ -388,8 +388,9 @@ function initScrollVideos(desktop) {
   for (var i = 0; i < pageVideos.length; i++) {
     var videoEl = pageVideos[i];
     videoEl.setAttribute('vindex', index++);
-    videoEl.setAttribute('preload', i >= preloadVideos ? 'metadata' : 'auto');
-    videoEl.preload = i >= preloadVideos ? 'metadata' : 'auto';
+    var preloadValue = i >= preloadVideos ? 'metadata' : 'auto';
+    videoEl.setAttribute('preload', preloadValue);
+    videoEl.preload = preloadValue;
     if (desktop) {
       videoEl.removeAttribute('controls');
       videoEl.autoplay = false;