[Context] In machine learning (ML) applications, assets include not only the ML models themselves, but also the datasets, algorithms, and deployment tools that are essential in the development, training, and implementation of these models. Efficient management of ML assets is critical to ensure optimal resource utilization, consistent model performance, and a streamlined ML development lifecycle. This practice contributes to faster iterations, adaptability, reduced time from model development to deployment, and the delivery of reliable and timely outputs. [Objective] Despite research on ML asset management, there is still a significant knowledge gap on operational challenges, such as model versioning, data traceability, and collaboration issues, faced by asset management tool users. These challenges are crucial because they could directly impact the efficiency, reproducibility, and overall success of machine learning projects. Our study aims to bridge this empirical gap by analyzing user experience, feedback, and needs from Q &A posts, shedding light on the real-world challenges they face and the solutions they have found. [Method] We examine 15, 065 Q &A posts from multiple developer discussion platforms, including Stack Overflow, tool-specific forums, and GitHub/GitLab. Using a mixed-method approach, we classify the posts into knowledge inquiries and problem inquiries. We then apply BERTopic to extract challenge topics and compare their prevalence. Finally, we use the open card sorting approach to summarize solutions from solved inquiries, then cluster them with BERTopic, and analyze the relationship between challenges and solutions. [Results] We identify 133 distinct topics in ML asset management-related inquiries, grouped into 16 macro-topics, with software environment and dependency, model deployment and service, and model creation and training emerging as the most discussed. Additionally, we identify 79 distinct solution topics, classified under 18 macro-topics, with software environment and dependency, feature and component development, and file and directory management as the most proposed. [Conclusions] This study highlights critical areas within ML asset management that need further exploration, particularly around prevalent macro-topics identified as pain points for ML practitioners, emphasizing the need for collaborative efforts between academia, industry, and the broader research community.