There used to be a hard limit of 100 levels deep in a single directory . I no longer see that limitation, but that doesn't mean it is not there
There is a way to split an Object into several smaller objects. It is not easy, not not very intuitive, and is not documented, just something we 'know'
If you are interested, I would need to know the OS-type of the server where this file system exists, and the Mount point