Yes, you can preview both public and Beta versions using the Sandbox Mode.
- Can I preview the Beta version?
- I am currently on Beta version, and the new public release is made. How can I go back to the public release?
- Can I upgrade to the Beta version if I use the Auto Upgrade?
Main articles about New Upgrade:
- ShortPoint SPFx New Upgrade for Office 365 and SharePoint 2019
- ShortPoint SPFx Auto Upgrade Feature
- ShortPoint SPFx Sandbox Mode Feature
You may check other FAQs about ShortPoint Upgrade in this folder.