Summarize contents of linked groups?

I’m not even sure how to name this topic :frowning:

Here’s what I want to do. I have a table of Instagram posts and a table of hastags. I have the hashtags organized by Group. I’d like to be able to link each post to a hashtag group and then display the hashtags within that group in the Posts Table.

Why can’t I add images to this post?! I’m sure I’m missing something dumb.

Any ideas?