also required by the institution are a description of what type of work the volunteer will undertake, where, and for how long -  plus documents attesting  and take full responsibility for the volunteer's daily expenses and departure from the country.

documents required include the entity's statement of responsibility for the voluntary during his or her stay in Brazil, and guarantee of his or her return to the country of origin.

lastly, the ngo must proof of being active and operational and declare responsibility for all and any medical and hospital expenses for the volunteer during his or her stay in Brazil, even though the volunteer is also required to show proof of health insurance.

there is no way to transition from a tourist visa to a volunteer-visa while remaining in brazil - the visa can only be issued outside brazil.