How do lawyers know the case materials in the investigation stage under the new criminal procedure law?

Hello, after the implementation of the new Criminal Procedure Law, the lawyer's rights as a defender in the investigation stage and the ways to know the case include the following aspects: (1) Learn from the public security organs about the alleged charges of the criminal suspect; Meet the criminal suspect and learn about the case from the criminal suspect; Providing legal advice and acting as an agent for complaints and accusations against criminal suspects; Apply for bail pending trial for the arrested criminal suspect. However, the relevant files and evidence are not known at this stage and can only be transferred to the procuratorate for reference.