Hi!
You might be glad to hear that a pro version of Advanced Forms soon will be released which includes the ability to set up a form to create and update posts and users automatically.
The plugin doesn’t currently come with this functionality built-in but it’s quite easy to achieve if you’re willing to write a bit of code. There is guide in the documentation detailing how to create a form which can create posts on submissions, you can find it here: https://advancedforms.github.io/guides/advanced/setting-up-a-form-to-create-posts/. Now instead of creating a post you could pass an existing post ID either as a hidden field or as parameter on the form and then use that to update the post data. I would recommend either using the action af/form/hidden_fields or the filter af/form/before_render for passing the post ID, both are documented.
Hope this helps!
