Whats the process to send both the AUP file and data file together
Audacity projects do not come as “one thing.” That’s a product request. Send the AUP file and then send the _DATA folder. They’ll both play as long as you have the right Audacity or more modern one, and the AUP file and _DATA folder are in the same location or folder.
I guess you could create one ZIP archive and send that. MyComplexProject.zip. I don’t know how convenient that is on Windows. And remember, Windows is going to hide the dot-zip in the filename unless you told Windows not to.
See this page from the Manual: http://manual.audacityteam.org/o/man/sending_your_work_to_others.html
99 percent of the time you are better off sending/sharing WAV files.