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BeeTee-Ess
You can try this uncommon procedure to upload azw3.
Take any epub book (book shouldn't be converted by Calibre) and convert it to mobi using kindlegen. Find application KindleUnpack at this forum and unpack your mobi with option "Split combination KF8 Kindle books". You'll obtain azw3 file. Rename this file either to .mobi or to .prc. Upload renamed file via Send-to-Kindle.
Sometimes uploading fails due to unexplained reasons but in most cases azw3 successfully uploads.
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