You can let the desktop application notify you when a screenshot is taken.
Make sure that the app is fully expanded. To do this, click the icon located on the lower right corner of the app.
Open the drop-down menu by clicking the icon on the top right corner of the app.
Click the Preferences option.
Place a checkmark on the Show notification when screenshot is taken option.
To enable screenshot notifications, please check this support article: How to turn screenshot notifications ON.