K2 Content Builder it is fully new K2 article submittion form and it is positioned as simplier way as a possible to submit an article and it is no such features available now.
So, you can use only tags for define extra data for items now.
Also, for advanced editor, you can use meta keywords fields.
Also, you can use "Link" field.
Extra field / attachments tab may be added in feature releases.
Yes, I can help you to show 1 opened text area and 1 opened image area at the start, it should require just a javascript for click one button after form loaded. Please, email me on This email address is being protected from spambots. You need JavaScript enabled to view it.
