CKEditor support

This feature request is still relevant. I’ve re-targeted the issue to the 8.x-1.x-dev branch.
I plan to submit a merge request with the feature in my next contribution.

Adding the patch file that could be used with composer.

Flagging for Needs review.

Test steps

1. Enable Required Modules
   Ensure the following modules are enabled:
   • - Media
   • - Media Library
   • - CKEditor
   • - Plyr
2. Configure the Media Type
   
   • - Go to Structure > Media types > Remote video > Manage display.
   • - For the Default display mode, set the Video URL field (or equivalent) to use the Plyr formatter.
   • - Save the configuration.
3. Configure Text Format for CKEditor
   
   • - Go to Configuration > Content authoring > Text formats and editors.
   • - Edit the text format used by your content type (e.g., Full HTML or Basic HTML).
   • - Under Enabled filters, ensure the Embed media is enabled
   • - Under Editor settings, make sure the Insert media button is added to the CKEditor toolbar.
   • - Save the configuration.
4. Test Embedding a Remote Video via CKEditor
   
   • - Go to Content > Add content and select a content type that includes a Body field (e.g., Article).
   • -In the Body field, verify that the Insert media icon is visible in the CKEditor toolbar.
   • - Click the Insert media icon.
   • - In the media library modal, select an existing Remote video media item or create a new one using a valid YouTube or Vimeo URL.
   • - Insert the media into the editor.
     
   • - Verify that the video preview is rendered inline within the CKEditor (not just a placeholder).
   • - Save the content.
   • - On the front-end, confirm that the video is rendered using the Plyr player
5. Test Embedding a Remote Video via CKEditor inside Layout Builder Modal
   • - Ensure that Layout Builder and Layout Builder Modal are enabled
   • - Go to Structure > Content types > [Your Content Type] > Manage display.
   • - Enable Layout Builder for the content type. Enable the "Allow each content item to have its layout customized" option.
   • - Create or edit a node of that content type and click Layout
   • - In the Layout Builder interface, click Add block and choose a Basic block that contains a Body field using CKEditor.
   • - In the Layout Builder Modal that opens, locate the Body field and ensure the Insert media icon is present in the CKEditor toolbar.
   • - Click the Insert media icon.
   • - Select an existing Remote video media item or create a new one using a valid YouTube or Vimeo URL via the media library modal.
   • - Insert the media item into the editor.
   • - Verify that the video preview is rendered inline within the CKEditor (not as a token or placeholder).
   • - Click Update and then Save Layout.
   • - View the node and confirm that the video is rendered using the Plyr player as expected.