
Hi AmulyaKR-1579,
Here is my colleague's reply
'''
Currently, there’s no such js api(save to a new docx file) available yet. There’re some internal discussions about this topic, but there’s no concrete plan yet. If you
Talking about Document.getfileaysnc, I believe she/he is mentioning the common API: Office.Document.getFileAsync. There’re clear definition and sample codes here: Office.Document interface - Office Add-ins | Microsoft Learn which she/he can refer to.
'''
Your sincerely