XMLActivity.kt

private val saveFileToSystemSAF: ActivityResultLauncher<String> = registerForActivityResult(CreateDocument(mimeType = "*/*")) { result -> // or mimeType = "application/pdf" / "image/*" 
        val uri = result
        val file = state.fileToBeSaved // the file/bitmap that needs to be writteen to user selected uri
        val context = this
        if (uri!=null && file!=null){
            lifecycleScope.launch {
                context.saveFileToUserSelectedPath(uri,file) // writing file to user selected uri
                Snackbar
                    .make(binding.root,"Saved file :${file.name} to user selected directory", Snackbar.LENGTH_SHORT) 
                    .setAction("show"){context.openSystemViewerForSAFUri(uri)} //check next section for info on this
                    .show()
            }
        }

    }