This might sound strange but, I really like the Show&Tell feature and I hope I’m not alone!
Unfortunately. it is not possible to post anything - “request fails with status 404” and also the configuration window doesn’t allow keyboard input to add/change the account.
as for now, we’ve had to temporally disable uploads from the Show&Tell to our default madewithvvvv feed. Posting to custom accounts should work as before, the bug related to the inactive input fields is fixed in the previews >= 7.0-0214.