Android Questions? Ask Android Device Experts for Answers ASAP
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'Manage Storage' usually means your Kindle is too full to accept anything more. So you may need to remove some apps, or some books even, that you do not need any more, from the device, before that error condition will stop.
If that does not seem to be what is wrong, then tell me the full and exact error message about 'Manage Storage', please, and I will advise you further.