What's the best way to send an audio track file so it's easiest to line up with the other tracks for the person receiving it???

I'm using bigfiletransfers so that's not the question. The hassle is lining up the tracks - I've had difficulty on both ends - sending and receiving - to get them to line up right with the other tracks. So please be specific LOL - abc...

I hope that's clear.

Thank you for your help.