def get_file_original_name(name):
    """
    Use this function to get the user's original filename.
    Filename is concatenated with <UUID>_sep_<FILE NAME>, to avoid collisions.
    Use this function on your models on an additional function

    ::

        class ProjectFiles(Base):
            id = Column(Integer, primary_key=True)
            file = Column(FileColumn, nullable=False)

            def file_name(self):
                return get_file_original_name(str(self.file))

    :param name:
        The file name from model
    :return:
        Returns the user's original filename removes <UUID>_sep_
    """
    re_match = re.findall(".*_sep_(.*)", name)
    if re_match:
        return re_match[0]
    else:
        return "Not valid"

    Use this function to get the user's original filename.
    Filename is concatenated with <UUID>_sep_<FILE NAME>, to avoid collisions.
    Use this function on your models on an additional function

    ::

        class ProjectFiles(Base):
            id = Column(Integer, primary_key=True)
            file = Column(FileColumn, nullable=False)

            def file_name(self):
                return get_file_original_name(str(self.file))

    :param name:
        The file name from model
    :return:
        Returns the user's original filename removes <UUID>_sep_
    
flask_appbuilder/filemanager.py