Update DatSphere-en.md

Author: cgpiao

projects/application/DatSphere-en.md

@@ -27,8 +27,8 @@ under development
 - integrate FileCoin
 
 ## Previews
-![Image](https://drive.google.com/file/d/1rICFF2y_pn3eH7_g-_P8WoSIjN3aqPfx/view)
-![Image](https://drive.google.com/file/d/1l4f4UqyxT-3eteWeZ2Dr3BMr7i8nQW7L/view)
+![Image](https://datsphere.com/api/assets/1d6e7d5a-91a7-4b63-b44a-31c45bc58011)
+![Image](https://datsphere.com/api/assets/49cb6699-d070-4bdc-8393-bb306a23ce37)
 
 ## Target Audience
 normal user, developer