How many times can the promotional film produced by Zhengzhou enterprise promotional film production company support to modify the content of the film? Is there a charge?

Zhengzhou basically allows customers to modify it three times. Every time there is a need to modify, the customer will directly connect to the later stage, and the corresponding form will come out. There will be a charge after three times. Generally, specific companies are different, depending on how you talk when you cooperate.