Post to different website instances at the same time.

Hello folks,

I have some instances of WP.

What I need: when I post an article in the main instance, it automatically post the article to all the other instances.

So I post an article “how I can lorem ipsum” in https://www.mymainsite.com and I need it in https://www.myinstance1.com, https://www.myinstance2.com, https://www.myinstance2.com

I did it for the title and the content of the post, but I’m struggling for move all the attached images to the other instances.

Some idea??

P.S: No, I will no adopt the multisite structure, thanks.