what transition to have between two screens when there is where minor change in content?

I have a series of files that the user can look into. User can open any file and view the file and user can navigate using arrows to view the next file and problem I am facing is where there is very minor change in the content and user navigates to other file what transition to have in between these screens , how to tell user that you are now viewing the Next file.

pfa attached images