feat: add cloudinary support (#1932)

website/content/docs/widgets/file.md

@@ -7,13 +7,21 @@ The file widget allows editors to upload a file or select an existing one from t
 
 - **Name:** `file`
 - **UI:** file picker button opens media gallery
-- **Data type:** file path string, based on `media_folder`/`public_folder` configuration
+- **Data type:** file path string
 - **Options:**
   - `default`: accepts a file path string; defaults to null
+  - `media_library`: media library settings to apply when a media library is opened by the
+    current widget
+    - `allow_multiple`: _(default: `true`)_ when set to `false`, prevents multiple selection for any media library extension, but must be supported by the extension in use
+    - `config`: a configuration object that will be passed directly to the media library being
+      used - available options are determined by the library
 - **Example:**
     ```yaml
     - label: "Manual PDF"
       name: "manual_pdf"
       widget: "file"
       default: "/uploads/general-manual.pdf"
+      media_library:
+        config:
+          multiple: true
     ```