Hi Sarah,
Regarding your question: Can we use Dropdown with autocomplete and autosuggest for “Country" field?
Auto-suggest is essentially a very smart dropdown, so I'm not sure how the two could be used together.
Although; your example of searching a list of objects (I am thinking about the "directory" page in BambooHR) could be argued as auto-suggestions. Not sure if I would call it that, but it has the same logic :)
In my mind, global search fields are kinda their own beast, although they do happen to have auto-suggest and auto-complete capabilities.
Not sure if any of that helps or is informative at all 🙃