Storing file in PostgreSQL database using NestJS

I have one form in React. It has many fields. once user click on the submit button all the field should be saved in database. It also contains one file attachment(pdf).

I dont know what the datatype of variable which will store file, I should take in entity class. Also what should be the database column type. I am using TypeORM for the same.

   @IsNotEmpty()
    @IsDate()
    endDate: Date;
    @Column()
    @IsNotEmpty()
    @IsString()
    personIncharge: string;

    @Column()
    @IsNotEmpty()
    @IsString()
    country: string;

    @Column()
    @IsNotEmpty()
    @IsString()
    comments: string;

    attachFile: string;  // Should I take file or string?

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