Hi Li,
Here are a few things you can check:
- If you are not able to see the preview (due to browser cache), try refreshing two or three times, or try to copy the link and open it in a new browser/ session.
- You might need to "renew" the preview links
-If the problem persists, please share your Adobe Target account credentials, the activity URL and the experience URL with me at waliany@adobe.com, or alternatively to customercare@adobe.com to open a support ticket so that we can explore the matter further. Thanks!
Warmly,
Amelia