You may want to create temporary files or directories for your Beam tasks. Beam includes Outputs which let you create files or directories when your function is invoked. You can add Output to the same file with your Beam.App() definition.
Outputs are ideal for cases where you don’t need to persist data between tasks.If you’d like to persist your data between tasks (meaning you can stop a Beam task, resume it, and your data will still exist), you should use a Persistent Volume instead.
For example, if you wanted to save images generated during a function call, you could define an output like this: 
app.Output.File(path="output.png", name="myimage")
You can also create directories, through the Output.Dir() method: 
app.Output.Dir(path="images", name="generated_images")

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Accessing Outputs

You can download files created during each function execution by logging into the dashboard, finding your deployment, and clicking on the latest task. Download-Artifacts