File / Path Exists Activity does not work

In this case, would it be possible for you to share some more specifics (maybe a dummy xaml of this issue?). If there is a bug like this, we will have to fix it and a dummy project would help us reproduce the issue.

Otherwise, for the issue at hand, please double check with this simple expression:
The image shows the UiPath Expression Editor with a message to log whether the file "project.json" exists in the folder using "System.IO.File.Exists". (Captioned by AI)