Zapier Update
If WooSender (1.0.16) is selected in your Zapier settings, please change the app to the latest one in the picture below.
What is the difference between WooSender (1.0.16) and the latest one?
WooSender (1.0.16) does have a feature that allows you to select pipeline & stage however, that only allows you to select the old stages from the default pipeline.
If you watch the video below, you will see the latest WooSender app got all pipelines and stages that you have in your account and it will help you to utilize better setting up the triggers.