Onyx Boox Poke5P User Manual page 22

Cloud Storage
After binding a third-party Cloud
Storage, you can download
documents from the Cloud
Storage to your device, but
uploading documents from your
device to the Cloud Storage is
currently not supported.
After embedding data to PDF documents, you can upload
the PDF documents back to the original folder in the Cloud
Storage. Other formats currently do not support this
feature.
To sync reading data, please log in to your ONYX Account.