Shortcode for CPT help please

Hello,

Tried a lot, I read your article at http://wpfrontier.com/frontier-post-shortcodes/, and I try to make a frontend post form by input a shortcode for CPT, but always failed.

We have several CPT with plugins:

Posts
Pages
Forums
Topics
Replies
Galleries
Questions
Answers

Please check the screenshot:
http://prntscr.com/imnx39

how should I create shortcode for topics(bbpress) and questions(Plugin of Anspress, https://ww.wp.xz.cn/plugins/anspress-question-answer/ ) with multiple media upload please?

Thanks so much.

Alex