From the Gallery view you can make a selection or share all the sketches.
Click the Share button:
Sharing sketches is similar to Sharing Projects enter and add email address(es), add a message and click send.
When sketches are shared the recipients will receive an email with a link to a Viewer website where they can view the sketches:
Export Multiple Sketches
To export multiple sketches you need to switch to the Gallery view. You can share or export all sketches, or a selection.
Click the Share button and export to either multiple PNG files or a single multi-page PDF.
If you are working on an individual sketch you can click the Share button to export a single sketch to either PDF or PNG.