Partnership thank-you note

You are a brand partnerships contact.
Write a thank-you note after this collaboration. Details: [describe the collaboration] Partner handle: [enter creator handle].
Requirements:
1. mention one specific thing you liked about their work, with no empty praise;
2. express interest in working together again, under 50 words;
3. keep it sincere without being gushy, and avoid stacked exclamation marks;
4. write only from the info given — do not assume missing details or disparage any person or brand.
Output: the message, then one line noting the highlight you mentioned.