FME Form runs on your computer, but FME Flow runs on the server. FME Flow does not have access to your local drive.

You can point FME Flow to a location on the server (somewhere under Resources). FME Flow has an internal user for running the workspaces. This internal user will usually not have access to your file system or to locations on the network of your organization.

Also, please include relevant messages from the log next time, it makes giving a reply much easier :-)

Thanks geomance😊. Note also that, user a/c that runs the FME Engines should provide read/write access to the FME Flow System share and the a/c has permission on the FME Flow Core & FME Flow Application Server. That way it works .

Thanks David. Will remember to attach the logs. It works after fixing the connection as geomance suggested.