A Microsoft file hosting and synchronization service.
Just want to add some info to my previous post.
After updating to Catalina my Storage Indicator still counts "Documents" (including OneDrive folder) size including all files that are actually in the "cloud" (near 30Gigs in my case). But if I go to Storage/Manage/File Browser I can see that OneDrive folder size counts only files that are actually on my local disk (near 300Mb in my case). Before updating to Catalina, OneDrive folder size was equal to all files size, including files in the cloud.
So now I can actually add files to my disk despite of Storage Indicator shows that My Documents occupy more space than my disk actually is :)
Also free disk space is displayed right.