Drupal 7.x

Hello,

"Edit Summary" link has mystically disappeared from the field Long Text with Summary, the same from all my content types at once;

I don't think I have changed anything recently; I can't understand what has happened;

I have similar installations on other subdomains - there "Edit Summary" is displayed correctly;

However - if I connect my faulty subdomain to a healthy Database - "Edit summary still does not display", even though it is displayed on the other subdomain with the same Database.....

I am using Drupal 7

What should I check?!

I just received a drupal 7 website from my friend for some learning. After I rebuild his website, everythings work fine. However, when I tried to log in to the admin pannel and tried to upload some photos on te page(tested for text, it works fine). I found out that those original photo cannot be shown on the admin pannel(front end can be shown). It show 'fail to load resource: the server responded with a status of 500(internal server error)' in the inspect page. When I tried to upload a new one, it said successfully uploaded.

While updating a Drupal 7 site I am getting the following error message. Is there any solution to this? I am using 7/93 version.

Display "Page" has an invalid style plugin.

Kind regards

I have a content type (CT) with an entity reference to other content type.  If the referenced CT does not have the content already, I would like to have a button to create a node of the referenced CT so you don't need to leave the node edit/create page etc.  The Inline Entity Form module does what I want except it doesn't honor the Conditional Fields I have setup on the referenced CT so I can't use it.  

How can I create a button that opens the Add Content for a specific CT and place it within a Node Edit/Create page?

Thanks for your thoughts and suggestions.

In the past, I always brought my drupal core up to date upon getting a security alert and it worked great - then...

Sometime back I tried more than once to update my Drupal core from 7.82 to the newest version available at that time - it caused error messages and took my whole multi-site down 

could the versions after 7.82 have a conflict with the versions of Ubuntu and MySQL we are running?

I will admit we are definately not running the newest version of either (thats out of my hands since it is controlled by my IT dept. Database Manager)