I've never seen this to be ab issue. A minute in g711 is about 480 kb, so even if you upload 2 minute recording that is going to be about 1 Mb which should not be an issue. How long of a recording are you planning on uploading?
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...