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You can't edit PDF on Kindle Scribe, because Amazon converts PDF to a proprietary Amazon format when you transfer it. IIRC you can send PDF directly to Kindle Scribe over USB, but then you lose the ability to annotate entirely; you can only read a raw PDF file.
Kobo has better PDF support but is primarily a reading platform. If you want even more functionality you should look at an Onyx Boox device, e.g. the Note Air 3.
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