network communication happens first to advertise.
your files will be uploaded almost straight away.
sometimes it feels like you have to prove yourself by
uploading a certain amount before your fit to download.

I find if you have no activity on your terminal your download
activity drops to minimal and your uploads maximize whether
you select the option or not. ( eg overnight!!! Upoad 3Gig
Downnload 300Meg)
It is also not the other point changing levels.
Activity at your terminal sees rate change to expected levels.
Also with completion you will find a lot of files will almost finish but
not quite.
Still with Xolox you eventually get what you want.