Yes, they have yet to add KF8 support to Personal Documents service. They strip out the KF8 segment. I keep checking, and sending nice messages to kindle-feedback, and hoping that will change.
You can upload to Dropbox and then download to Fire (or K4Android?) if you install Dropbox on the same device. Then use a file manager to move it to the Documents folder. It seems I have to restart Fire before they show up (firmware 6.3). If you have the email client configured, sending as a file attachment to that address might also work, but I haven't tried that.
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