Fuze+ Video Requirements

Having some minor issues regarding video transfer. SMC changed my files into AVIs (again, does the extension really matter?) but they were about  5-6x bigger than the original MP4s I thought I would be able to use, which failed. However, the audio/video in both of the videos I converted were badly synced.

I’m trying again using the recommended profile for Any Video Converter, and hoping everything will work smoothly this time around.