Hello Alyssa,
It looks like there's an issue with configured search source's ID. Do you think you can try going into the app's configuration panel and remove/re-add the search source?
Steps:
1. Navigate to Interactivity > Search >Search Configuration
2. Click 'Add'
3. Select 'Layer' tab
4. Opt into 'Map' option below tabs
5. Select 'Huntinghton Orchids' option
6. Click 'OK'
7. Configure the search source. Important: You must add at least one search field to the layer source.
8. Click 'Done'
If you run a test search, a selected result from the search widget should populate the content in the feature content panel.
As for setting a title in the feature pop up label - this can be set by configuring the 'Pop-up title' through the 'Configure pop-up` option in the Map Viewer . You can set a field attribute such as the name of the feature i.e. `{Name}`.
I've created sample app with your data and got everything working. Please let me know if you would like me to share it.
Thanks,
Ryan