Upload page site mapping typeahead is not obviously filterable

[atruskie]

Is your feature request related to a problem? Please describe.

Multiple users have now told us they can't find the site/point they're looking for in the mapping typeahead on the metadata review page.

Describe the solution you'd like

We need some prompt (probably inline text) to suggest they should type to filter.

Describe alternatives you've considered

Maybe just make the options typeahead scrollable?

Additional context

This view here. People just assume something is wrong, or that there is a cap to the number of points in a site.
Often they do not seem to realize the text box above is something they can type in to filter.