multipart/form-data help

[NaviTheCoderboi]

guys i have this elysia model

export const createSongModel = new Elysia().model({
    createSongModel: t.Object({
        title: t.String(),
        artist: t.String(),
        artistSocial: t.Optional(t.String()),
        album: t.String(),
        playlistId: t.Number(),
        song: t.File({ type: 'audio/mpeg' })
    })
});

{
            type: 'multipart/form-data',
            body: 'createSongModel',
            detail: {
                tags: ['Song'],
                summary: 'Create a song'
            }
        }

why do i get error even i am sending formData