Ultherapy or dissolve Voluma - which should I do first?

Hello, I have Voluma fillers in my cheeks that I got around 2 years ago and I really don’t like them anymore. I’ve been thinking about dissolving and I’m also scheduled for an ultherapy session. Is it ok to dissolve the filler after having ultherapy done or it can somehow ruin the ultherapy results? Should I do the dissolving prior? I’ve been afraid of dissolving as I’ve heard a lot of bad stories and I got advised that maybe ultherapy will help a bit with reducing the filler that I have left.