"Rules of Criminal Procedure of the People's Procuratorate" Article 49 If a defense lawyer or other defender is allowed to consult, extract or copy the case files in the People's Procuratorate, the case management department shall make timely arrangements, and the case handling department shall provide the case files. If it cannot be arranged in time due to the work of the case-handling department, it shall explain to the defender, and arrange the defender to read the papers within three working days from now on, and the case-handling department will cooperate.
The people's procuratorate shall set up a special place or electronic file review terminal equipment for defenders to consult, extract and copy the file materials. When necessary, the people's procuratorate may send personnel to assist on the spot.
Defenders can copy, photograph, scan and burn files, and the people's procuratorate does not charge fees.
To sum up, according to the existing laws and regulations, lawyers can take photos when marking papers.