End to end encryption on pydio

Does it provide E2EE ?
There mention about encryption on data source, but where and how keys are stored?
So, it helpful for storage provided by a third party, but I want to encrypt data on pydio instance too

Hi, no we do not provide e2ee, only at rest ( = in the storage )

But where keys are stored? Does it encrypt at rest (in the storage) by public key and decrypt on device by private key? How it secures if pydio and storage (both on one server) would be compromised?