How Did Sauron Get His Ring from Numenor Back to Mordor but Not Off His Dead Hand?

In a letter, Tolkien says that Sauron had his Ring in Numenor, which seems to contradict The Silmarillion. But if he did, how did he get it back to Middle-earth when Numenor was drowned and his body destroyed? And if he didn’t need a body to carry it, how was Isildur able to claim it from his corpse after the War of the Last Alliance?

For my video on who really killed Sauron, click here: https://www.youtube.com/watch?v=Fp2OMqRdjcU

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