You can *read* PDF loaded over USB, but to write directly on them they need to go through Amazon's servers to be converted to their fixed layout KFX Print Replica format. With the Scribe you do not get your original PDF back with an annotation layer as you'd expect on other systems. You get your PDF double-converted with the annotation layer flattened down into it on that second conversion, back to PDF. If you need secure/offline and separate annotations on the original PDF then you'll need to find a different device/system to use.
https://www.amazon.com/gp/help/custo...m13k3txFI4EvDV
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Note: You can write directly on the page in PDF documents, or write on the page in other personal documents imported through the Send to Kindle service. Kindle Scribe doesn't currently support writing directly on the page in PDF documents loaded via USB-C or previously sent to your library before 11/11/2022.
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