I need a file watch to check for a file every 30 minutes at :15 minutes and :45 minutes of the hour, ie 1:15, 1:45, 2:15, 2:45
I set file watch to every 30 minutes, but how does it know what to start the 30 minutes from?

File checking does not start at any specific time. It starts when the scheduler starts or after a new file-watch job is created and saved, which can happen virtually at any time.

If you want to check for a file starting at specific point in time you better create a script type job with "All Day" running every 30 minutes. In the job script you can use FileExists to test for the file existence and depending on the test result perform or not perform the main part.

If you run version 3.3.0 or later you can also use "Daily and Weekly" schedule and specify file check times as a comma-separated list like
1:15, 1:45, 2:15, 2:45.

: I need a file watch to check for a file every 30 minutes at :15 minutes and
: :45 minutes of the hour, ie 1:15, 1:45, 2:15, 2:45
: I set file watch to every 30 minutes, but how does it know what to start the
: 30 minutes from?