20 votesAnonymous commented
This happens on folders within OneDrive for Business which have more than 5k items within the folder.
This is a major flaw in the sharing system as certain small business types need to be able to have a folder shared out to a customer (external user) but only have 1 internal user with access.
An example of this is any small business that uses AutoCAD, any 3D rendering software, or animation software. What happens in these situations is that 1 file will generate a large number of files, that are subsidiary child files, used for each part or step of the process. In some cases 1 animation file can have upwards of 300 or more children files per minute of animation.