Hi @Jeremy Gruman, this is an old post and I see it never received a response. I'm so sorry about that!
Since then, we have added the ability to add and edit metadata for files and folders from the Web UI via Egnyte's Metadata API. You can read about it in this help article.
Please let us know if you have further questions related to this. Also, you might check out this Idea submitted by the community for adding metadata to files. If this is more what you're looking for, I encourage you to click the thumbs up (kudo) to show support and add a comment if you want to specify your requirement.
Best, - Julie PS. Help others find answers by selecting "Accept as Solution" if a post answers your question.