If you have a workflow you use frequently—for example, adding a watermark to large sets of images—and you want to make it easy to get to, you can create a Quick Action workflow.
Create a Quick Action Workflow
In the Automator app on your Mac, choose File > New
Select Quick Action, then click Choose
Specify any of the following: Workflow receives current, Application, Input Is, Output replaces selected text, Image, or Color
Add actions to your workflow
To save a workflow, choose File > Save