We have been sharing our website pages and articles to LinkedIn for almost 4 years using
https://www.linkedin.com/shareArticle?mini=true&url=https://example.com/page1/
Until recently, the share block would appear with an image, caption and summary. Just as in Facebook. But now, we find that the summary does not show. I know many have raised this same concern here. One solution I saw in this forum is to switch to forcing visitors to sign into our LinkedIn app and post the status via REST API. My question is, Is this really necessary. We don't have a login feature for our website and to force people to login to LinkedIn app just to show description which is already part of the og tags on the page. Surely someone from LinkedIn can respond to this issue since so many have raised it.
You can use Post Inspector (https://www.linkedin.com/post-inspector/) to preview how your posts will be shared on LinkedIn.
Alternatively, you can use the Share Plugin (https://learn.microsoft.com/en-us/linkedin/consumer/integrations/self-serve/plugins/share-plugin) to add a widget for users to easily share content on LinkedIn.