Hi Linga,
If you’re working with a UI-Only field, it would by definition not be linked to any Salesforce fields. That means its value can’t be saved to Salesforce, and is going to start out unset every time your Skuid page loads. If you’ve also created a custom checkbox field in Salesforce though, you should be able to use that as you’re hoping, if I’m understanding correctly. In case you haven’t run across it already, here’s our documentation on UI-only fields and models. That should help give some context on what the UI-only fields can be used for.
-Mark
