You can preview individual files in the
Modified Items list of your sandbox. This action is
also available when browsing content within a sandbox (user or
Staging).
Navigate to the Sandbox view of the web project you want to work
with.
Locate the content item you want to preview:
In your user sandbox (My Sandbox),
click to expand
the Modified Items list.
Click (Browse
Website) for your personal sandbox in the
User Sandboxes pane. In the sandbox, navigate
the folder structure to locate the desired folder or file.
Click : Preview File in
the Browse Files pane or Preview
Folder in the Browse Folders
pane. A separate browser window opens displaying the selected
file or folder.