The findmypast.com family tree is rapidly evolving. Unlike the other three very large genealogy database companies, findmypast.com is a relative newcomer to hosting a family tree that is integrated with their data collections. Recently, they took a major step by providing for a way to attach records to your Findmypast family tree. The connection between the people in the family tree and individual records is not yet complete, you must search for the person in your file before you can attach the record. There is no way to use the person in your file to search and then automatically attach the records found to that person or to attach the record to other people shown in the record as can be done in the three other large online genealogy database programs.
You can find a complete explanation in the findmypast.com post entitled, "Attach records to your Findmypast family tree." I suspect that findmypast.com will continue to develop additional features of their program in the not-too-distant future.