I cannot test the new release on the site collection that uses Site Collection App Catalog? What for can I use it then?

Using Site Collection App Catalogs might be practical when the company wants to let a few site collection admins to use the ShortPoint App.

Please, keep in mind, that it does not influence on the New Upgrade and rollback processes. If the upgrade/rollback or enabling/disabling Auto Upgrade is done on one site collection, it will affect all the site collections.

If you use Site Collection App Catalogs only to control who can add the ShortPoint app to specific site collections, you may restrict their permissions on Tenant App Catalog. Please check the Option 2 of this solution article for more details: How to Control Who Can Add ShortPoint SPFx App to the Site.

Related articles:

• How to Control Who Can Add ShortPoint SPFx App to the Site
• I am using Site Collection App Catalog. Can I upload New Upgrade package to it?
• If I have multiple site collections and one of them is using Site Collection App Catalog, can I test the new package on it before installing on the entire tenant?

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.