Problem thumbnail post (twitter)

Hello.

I’ve installed this plugin to post automatically articles on twitter.
The particularity of my website is that posts are published by user logged in and not from wordpress panel. User compile a form from frontend to insert a new post.

The problem is your plugin does not take correctly the image/thumbnail to attach to tweet. I’ve tried to:
– enable Add Open Graph Tags, because the single page has this tag, but it doesn’t work
– create a custom field to the article that contains the link of the post thumbnail and I’ve enabled Alternative “Featured Image” location, setting this custom field in “Custom field name”, but it doesn’t work.

I saw that updating / publishing an article from the backend, the plugin takes the image correctly.
Can you help me, please? ??

Thank you.

https://www.ads-software.com/plugins/social-networks-auto-poster-facebook-twitter-g/