HI Ahmed,
Document
editor have options to get the current document content as SFDT and blob format.
Once get the content, process it in backend and then save it in database.
Following
KB have to options to export the document in server and you can customize it to
save it in database.
https://www.syncfusion.com/kb/10304/how-to-load-save-file-in-web-server-for-asp-net-core
Otherwise,
using serialize() API, you will get the content as SFDT format. Then send that
SFDT to backend for conversion, then save to database.
https://ej2.syncfusion.com/documentation/document-editor/server-side-export/
https://github.com/SyncfusionExamples/EJ2-Document-Editor-Web-Services/blob/master/ASP.NET%20Core/src/Controllers/DocumentEditorController.cs#L377
Above
file have code snippet to save in server and you can customize it.
Please
let us know if you need any further assistance.
Regards,
Ajithamarlin E