Deletion of files after being sent to Kindle

Hi all,

I asked on the Amazon forum about what happens to documents that I send to Kindle. I was told that they stay in my account on Amazon Drive (cloud) until I delete them. Sure enough, when I looked there were over 500, a mixture of Send to Kindle and Push to Kindle. I deleted them all OK.

I also noted a message on my Amazon Drive account saying my free trial of online storage had ended. Would this affect files sent there by Push to Kindle, I wondered? I sent a few new documents, which reached my Kindle but haven’t yet appeared in my Amazon Drive account.

Is it a timing issue, or are they stored somewhere else? If somewhere else, where do I look, so that I can manage them?