Whatever the file it is processing at the time requires. Files are processed as 'encountered' by recursion. There's no sorting to process by size, date, action or anything else. This is to minimise the number of changes of directory, which in some cases (FTP, NAS...) can be extremely slow (also the KISS principle).
You can sort them in the Differences window (and by default, the Differences window will always be sorted on something), but that's only for display purposes. It doesn't affect the order of processing.
You can sort them in the Differences window (and by default, the Differences window will always be sorted on something), but that's only for display purposes. It doesn't affect the order of processing.