File integrity no checksum / hashes for uploads


how is file integrity managed by the client?
Using rclone for uploads SHA-1 hashes are generated and stored on the Nextcloud server.
For files uploaded with any of the Nextcloud clients or the web UI no hash seems to be stored on the server. At least I can’t retrieve it with rclone.
So how are bit exact file uploads and downloads achieved?

Moved to development because it needs some deeper insight on the sync protocol that exceeds the normal sync client topics and will be lost there.

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Anyone any ideas? Or does this mean file integrity is not handled by the client in a reliable manner?