How many comments can you read from this post ??

Zero from 3 different instances. All three show 3 cross posts and zero comments on ask three of the posts.

This seems like something that would be easy enough to test.

3

Iirc you can only cross post from the default web interface if the post is a url post.

If the post includes a url, tap the circled symbol, then pick the community.

If you are using an app it will vary from app to app. With Mlem it is an option when you share the post.

I thought the image in the thumbnail looked a bit too new to be from a movie released in 1984.