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yes, you only need usb for big files - like a 1 Gb video. both send to kindle and Calibre companion are fine for books, though send to Kindle has some limitations.
you can also add misc unconverted docs e.g. word docs, PDFs to your documents folder at amazon cloud , if you keep a copy of your cloud drive on your PC, & they will appear on device.
I actually use dropbox for misc stuff, that also works well. Get the dropbox app onto fire tablet going to dropbox.com with silk browser and downloading the app. it is still not in amazon appstore
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