Currently, it is not possible to preview or edit content of multiple content_types (for instance a folder), using the Page tab, under a siteaccess that has a custom tree_root value.

steps to reproduce

• install ezstudio with demo content
• assign tree_root of a siteaccess to "Another Landing Page"

          no:
              languages:
                  - nor-NO
                  - eng-GB
              content:
                tree_root:
                    location_id: 105
  

• Login on admin interface
• Using the Content Tab, navigate to "Another Landing Page"
• Create a folder inside this location (name it "Test Folder")
• Using the Content Tab, navigate to "Home"
• Select the Page Tab
• Select Siteaccess: no
• On the previewed site menu, you should have a "Test Folder" link
• Click on it
  => You'll run into a "Cannot get page information from the server" error