Paperly might do it if you're willing to pay for it. Qiqqa is more focused on organization/reference management but can also do notes and things, and I believe it can be made to work on a Mac with some workarounds. Neither have a cloud service integrated, but you can link a watch folder with any of the usual cloud services if you need it. Source: about 3 years ago
Do you know an article comparing paperly to other products?
Suggest a link to a post with product alternatives.
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