Is anyone else having problems with the QB APP? Specifically creating a Invoice/estimate. The custom fields I created do not show up in the app

Thanks for visiting the QuickBooks Community, Jacob.

Currently, the option to sync the custom fields through the QuickBooks Online (QBO) mobile app is unavailable. As a workaround, you can use your browser to show the custom fields. You can visit this article for the requirements to access QBO seamlessly: QuickBooks Online access for mobile devices.

You can also check out this article for more details about the features available in the QBO mobile app: Compare mobile app features.

Drop me a comment below if there's anything else you need. I'd be happy to offer additional help. Have a blissful day!