can check the source files from the saving path.
1. Documents
opened
directly
from
other
non-scanning path in Storage.
2. Documents that are not in the default scan path after
the default scan path is modified.
Sync settings
You can sync reading progress
and data across devices via
Onyx Cloud. The feature is on by
default. If you do not want to sync
your reading data of all documents, you can turn this
feature off.
If you do not want to sync the reading data of some
documents, long press their book covers to go to Sync
Settings, and turn their sync off individually.