moving data from sage 50 desktop to my sage business cloud


I have already migrated my account 2020 and I had to complete 2021 which i did in the desktop as I am much more familiar and was able to do it quickly, now I want to transfer that info into my sage business cloud accounting, and I have tried many things very unsuccessful. Can anyone help or do i need to contact support and which one do i contact the sage 50 or the  cloud.