Hint on how to record instruments and vocals

I usually send a few tracks off to a buddy that is still “In the Biz”. He has a song that needs vocal harmonies and I have some to send him. But…Old and lazy I guess. But he is the keyboard guy and I’m the guitar guy and we were in a band together in the good old days. We have two former band members who have passed away. I guess we survived! I am as technical as a bowling ball. But isn’t dropbox a wonderful thing? Much better than sending a DAC tape off and wondering if it will get there intact.