Synchronize refusing to work with almost identical audio files

To resolve the issue, try selecting the Mixdown option instead of choosing a specific audio track number when syncing.

Here’s why this matters:

• The audio track number you select for syncing corresponds to the channel numbers labeled on the clips (e.g., Ch 1, Ch 2, etc.).
• In your first attempt, you’re syncing with Track 1, but there’s no audio signal on Ch 1 for the top clip. When you try syncing with Track 3, there’s no audio signal on Ch 3 for the lower clip.
• Even if you delete some audio clips in the Timeline, the channel numbers don’t change, so this won’t affect the syncing process.