Hi Williams,
Greetings from Syncfusion support
Currently the feature, File Manager integration in RichTextEditor is not available in EJ2 RichTextEditor control. We have considered this feature in our end and this will be available in any of our upcoming releases. Meanwhile you can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through this link,
Thanks,
Indrajith