For image processing actions the WorkflowAction=>LoadImage should be executed first after image save the WorkflowAction=>UnLoadImage to free the resources. The LiveViewEvent and ThumbChanged will handle automatically the image loading and unloading so no required to use WorkflowAction=>(Un)LoadImage. Every action and event have a condition field which is evaluated for every execution.
string.IsNullOrEmpty(SessionFolder) - Check if a variable is empty or not
Will assign a new value to the selected variable. In Formula can be used C# style expresion, variable names are cases sensitive. Variables can be referenced by name.
Counter+1 - Increment a variable
Folders.Split('|') - Get first element from a list variable
DateTime.Now.ToString("yy-MM-dd") - Return current local date