In Wix blog you can add HTML code to blog posts. So you can write a blog post in Google Docs for example, download it to html and paste it into your wix post.
I am concerned that SEO will not pick up on the html code. Should I skip adding HTML into blog posts? Or will SEO pick up on the HTML code? Thanks!

Hello,
you can write your posts using HTML, SEO will pick it up, so don't worry about that.
Hope this helps!