Earliest Muslims Believed Some of the Quran was Lost

The Christian website Islam Critiqued offers a short, approximately six-minute video that demonstrates from the earliest references that the earliest Muslims did not believe in the perfectly-preserved Quran, and this belief was rather long in developing if the title of this video is accurate: "Perfect Preservation of the Quran is a Modern Invention."

This was posted a couple of years back, so non-Muslims were already figuring things out for themselves.