Onyx Poke5 BOOX User Manual page 24

Cloud Storage may use different login methods. For example,
with NextCloud, you need to apply for an application password
on the webpage and use it to authorize login instead of using
the account password.
Cloud Storage Settings
PDF documents can be
automatically uploaded after you
exit the documents. The upload
speed is limited by the network
speed and Cloud
Storage speed limit. It is not recommended to upload larger
documents frequently. Instead, you can manually upload them
when needed by long-pressing the cover and selecting manual
upload.
After logging into the Cloud Storage, you can set the
automatic upload size of PDF documents in the Cloud