Having some weird issues that seems to be caused by mystical powers? This might help.
I have lost my encryption key - how can I recover it?
If you lose the encryption key before sharing it to another device, then it is lost and you will need to re-upload to generate a new one. This is because Jetdrop creates new and dynamic keys for every single upload and no two keys will ever be the same. But
UPDATE - Can I delete a file uploaded to Jetdrop?
When a file is uploaded to Jetdrop Lite, it is stored for 7 days before automatically being removed. There is no way to request it to be taken down, however the only people that can access the upload will be whoever had the encryption key which was generated when the