Can't send anything from my laptop to my One Plus 6. I wanted to copy music and it didn't work. I use the cable and it took a long time. It works before a year

Can't send anything from my laptop to my One Plus 6. I wanted to copy music and it didn't work. I use the cable and it took a long time. It works before a year ago, but that now, it didn't. I don't give up, since I still use the app.