When trying to insert an image using a built-in WYSIWYG tool, it fails with the following error:
Library doesn't physically exist
The issue will be fixed in a future update for which a new Knowledgebase article will be created. You may subscribe
to new articles on Parallels Plesk Panel products if you wish to receive notifications about their creation.
Do not use the built-in WYSIWYG editor for inserting images.