Uploading audio files

What does SONAR have to do with that? Most (or all) of the cloud and music sharing sites are accessed via web browser.
 
Also, you need to provide more info to get a good answer.
 
Two questions:
 
1) By audio files, do you mean just a rendered WAV (or other format) file of a complete song or all of the audio files associated with the project?
 
2) By net collaboration site, do you mean a simple cloud account that you can upload to and make your files available to others, or to something like Soundcloud, or what?

Hi,
 
4) A bit more music knowledge other than just play with your ... errrrrrr .... keyboard?

Interesting.
 
I was, however, adding to the possible choices the OP did not tell us he wanted.

From within SONAR export your individual tracks (as either stereo if necessary or mono) as .wav files (at least 16/44.1). Send those files to Kompoz.
 
Tell the others what the tempo map and time signature is.
 
They should be able to import those tracks to their DAW. 
 
When they are done they should export their work to you in the same way.
 
Don't fret too much if they send 24/48 files as SONOR will convert on import to the project's format.