I am using CKEditor and WYSIWYG. After updating Drupal core to 8.5.6, I cannot upload an image using the CKEditor's 'image' button anymore saying "Image Field is required."
I have checked CKEditor's plugin settings. Image upload's enabled there.
I have not found a solution yet. Any help will be appreciated.
PS: If I add an image using html "img" tag then it shows up properly, it's only the button that is not working properly.