Moving from low-fidelity to high-fidelity prototypes in UX design can be tricky and come with many challenges. Let's break down the main issues and some ways to tackle them.

1. Resource Allocation: High-fidelity prototypes need more resources. This means more time, money, and skilled people than low-fidelity ones. When teams have limited resources, they might need to put other projects on hold, making teamwork harder.

2. Stakeholder Expectations: As the prototypes get more detailed, people involved might start to expect too much. High-fidelity prototypes can make it seem like the final product is almost ready, which can lead to misunderstandings about what the end product will actually be. Managing what everyone thinks can be a challenge.

3. Iterative Feedback: Low-fidelity prototypes allow for quick feedback. But when switching to high-fidelity, making changes can take longer and cost more. This could lead to designs not being flexible enough to meet user needs.

4. Skill Gap: Some teams might find the tools for high-fidelity prototypes complicated. This can result in products that don’t meet the original design goals.

Solutions:

• Gradual Transition: Start by slowly changing low-fidelity mockups into high-fidelity models. This helps teams adjust to the more complicated parts step by step.
• Clear Communication: Keep talking with stakeholders to manage their expectations and make sure everyone understands the prototype’s goals.
• Training and Resources: Provide training for team members to help them learn the necessary skills, making the transition smoother and more efficient.

By thinking ahead about these challenges and planning solutions, teams can improve their process of moving from low-fidelity to high-fidelity prototypes, even if there will still be worries about success.