Edit MS word file online in browser

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C#

Office365

We have a Web based File Management system in which Word documents are uploaded. Documents are stored in the database. We would like to allow the Word document to be launched for editing in a separate tab in the browser using Microsoft 365 Word online.
The user can edit the document, close the tab, the edited Word document is pushed back to the application/database similar to how other vendors do this and also similar to Microsoft Teams Web version.
We want it to be a seamless process which eliminates the need for the user to download documents to the local drive, edit and upload it back to the application.

Could you please let me know if there is an API that Microsoft provides or any other way that can help achieve this?

What I have tried:

We tried the third party controls like aspose and TextControl. But both are giving formatting issue in end result.