HtmlEditor: add image formats + note (#5208)

api-reference/_hidden/dxHtmlEditorImageUpload/fileUploadMode.md

@@ -12,4 +12,6 @@ Specifies how the HtmlEditor UI component uploads files.
     href: "https://js.devexpress.com/Demos/WidgetsGallery/Demo/HtmlEditor/Overview/"
 }
 
+If you set **fileUploadMode** to `server` or `both`, you need to specify [uploadUrl](/Documentation/ApiReference/UI_Components/dxHtmlEditor/Configuration/imageUpload/#uploadUrl) and [uploadDirectory](/Documentation/ApiReference/UI_Components/dxHtmlEditor/Configuration/imageUpload/#uploadDirectory).
+
 Refer to the [imageUpload](/api-reference/10%20UI%20Components/dxHtmlEditor/1%20Configuration/imageUpload '/Documentation/ApiReference/UI_Components/dxHtmlEditor/Configuration/imageUpload/') topic to see an example.

concepts/05 UI Components/HtmlEditor/10 Formats/10 Formats.md

@@ -1,4 +1,4 @@
-The following tables list available formats and their values grouped into four categories: inline (or text), block, embedded, and table formats.
+The following tables list available formats and their values grouped into five categories: inline (or text), block, embedded, image, and table formats.
 
 **Inline (or text) formats**
 
@@ -103,6 +103,51 @@ The following tables list available formats and their values grouped into four c
  </tr>
 </table>
 
+**Image formats**
+
+<table class="dx-table full-width">
+ <tr>
+    <th>Format Name</th>
+    <th>Supports Pasting into HtmlEditor</th>
+    <th>Supports Drag and Drop from File Explorer</th>
+ </tr>
+  <tr>
+    <td>*.png</td>
+    <td>Yes</td>
+    <td>Yes</td>
+ </tr>
+  <tr>
+    <td>*.jpg</td>
+    <td>Yes</td>
+    <td>Yes</td>
+ </tr>
+  <tr>
+    <td>*.gif</td>
+    <td>Yes</td>
+    <td>Yes</td>
+ </tr>
+  <tr>
+    <td>*.webp</td>
+    <td>Yes</td>
+    <td>Yes</td>
+ </tr>
+  <tr>
+    <td>*.bmp</td>
+    <td>Yes</td>
+    <td>Yes</td>
+ </tr>
+  <tr>
+    <td>*.svg</td>
+    <td>No</td>
+    <td>Yes</td>
+ </tr>
+  <tr>
+    <td>*.ico</td>
+    <td>Yes</td>
+    <td>No</td>
+ </tr>
+</table>
+
 **Table formats**
 
 The following formats apply only to the `<table>` element: