How to reproduce

• Connect to the cms
• Select a page
• Add attachments files
• Select a zone of a page
• Add the attachments service
• Preview the page
• Drag and Drop files, or delete a folder
• Click on "Rafraichir la page"
• On the cms it is ok
• Click on "Prévisualiser"

Actual behavior

• The preview is not updated

Expected behavior

• The preview is updated