What is the ruling on working for a company that assists the Spanish Consulate in preparing traveler files for Spain, where citizens are asked to provide an insurance document from insurance companies?

If the insurance you are requesting is commercial insurance, then you are not permitted to request it unless the person is compelled to travel and finds no other option. In that case, it is permissible to assist him, and the sin falls upon the one who compelled him into the forbidden contract.