Micro sd not holding music

Hi guys ive got a 64gb micro sd which i was planning to use for music in my headphones however whenever i save music to it it just isnt there , ive tried music from spotify , amazon music and youtube but no luck with any of them , can anyone help me out ?

Hi @Bacon90,

Have you opened a Support Case? If not opened, for more information, please contact the SD Technical Support team for best assistance and troubleshooting:https://kb.sandisk.com/app/ask