1. If the admin of the site can include multiple links in 1 post but, non-admin users can’t and receive an error:

“There was a problem posting your update. Please try again". 

See the image below:

2. Or, if the members cannot share links in their posts due to the error  "You have posted too many links."

Here's how to resolve it:

    1. Navigate to WordPress dashboard - Settings - Discussion.

    2. Look for Comment Moderator and increase the number of max links on the number box.

    3. Don't forget to click the "Save Changes" button below the page to apply the changes.