Hey, I have the same question, using Final Cut Pro X for the first time. I ripped some footage from a DVD to Prores using Cinematize. Unfortunately I didn’t use optimal settings and ended up with some banding. I’d like to replace the source files with higher quality rips without losing any of my timeline. I don’t see any option to “Reconnect Media” in FCP X. Is there still an easy way to do this or is this another feature that bit the dust? Thanks!