I think the international public text you refer to should be the public text of the PCT international application, which mainly includes the description of the project information, abstract, abstract drawings, claims, specifications and drawings. Among them, the information describing the project includes the most basic information, such as the applicant, inventor, invention name, etc. It also includes some requirements of the national stage.
In general, changes in the international phase only need to be submitted to the International Bureau (IB) or China National Intellectual Property Administration (SIPO), and no relevant supporting documents are needed.