Thanks for the question. As I’ve said in other responses, the integrity of the Quran through the centuries is of utmost importance as many Muslims hinge their faith on the claim that the Quran has never been redacted, edited, or otherwise changed. Modern scholarship shows this not to be the case and Muslim apologists are starting to withdraw from the position that it’s been completely preserved. And yes, Uthman, one of the early Caliphs, commissioned a man named Zayd ibn Thabit to go throughout the expanding Islamic empire and seize all the variant versions of the Quran and have them compared to Uthman’s favored version. All copies that Zayd could find were then compared to Uthman’s and, if they didn’t conform to his, they were burned. Still, some different copies survived and we have evidence of them today.
In fact, I would commend to you a debate between Jay Smith and Shabir Ally on this issue. You can find it here: https://www.youtube.com/watch?v=fWHV9VnOJtc.
You’ll notice that Shabir doesn’t refute the manuscript and historical evidence that Jay Smith presents on the textual history of the Quran. Instead, Shabir relies on a novel (and I believe flawed and possibly heretical) argument that numerology validates the Quran. I’ve responded to that argument as have others.
I hope this video will help.