Where is the saved .vzm file?

I am trying to save text messages for a particular caller. In the Message+ app, in the "Conversations" window, I long-press on the caller and select Save messages. The next window "Save Conversations" shows a default file name (which I can change if so desired). Then I click Save and that window closes and it returns to the Conversations window. If I long click again and go to "Save Conversations", it shows the file I saved. I want to know where this file is on the filesystem or be able to send that file in an email. As it is, I can only Restore, which is not what I need. Looking in the file browser, I do not see this file in Downloads, or anywhere. The mobile service is Xfinity/Verizon. I called them and they were not able to help Device: Pixel 6a Android version: 14