All the data that is stored in the cloud on the internet is owned by several different people.
Basically whoever uploaded the data to the cloud owns that data that is stored on those web servers in the cloud.
For example my blog is hosted on cloud web hosting so my database and files are in the cloud so I own that blog data that is in the cloud.
I also have photos and videos stored in the cloud and those videos and photos are all my data even though someone else owns the data center and servers that the data is stored on.
Not just one company or person owns the data on the internet including the cloud.
So if you have files stored in the cloud then that data is owned by you.