In 2022, the Rhineland-Palatinate State Archives Administration acquired the photographic legacy of Herbert Ahrens, a Nazi-era photographer who produced approximately 66,000 images between 1933 and 1945. Manually indexing a collection of this scale would require many staff years. This workshop report describes the ongoing collaboration with the Fraunhofer Institute for Industrial Engineering to develop an AI-supported indexing workflow using multimodal language models. The project addresses successive challenges including facial recognition, automated metadata extraction, data protection compliance, and the assignment of retention periods.This conference paper is published as part of International Archives Symposium in Namur (2025). Open Data and AI. New chances for Archives? Proceedings.