Last week I booked two roles. The casting calls were found through Facebook and when submitting, my preferred way to send the audition is to link it to an unlisted YouTube link. What I notice about these auditions over the others I didn’t get in the past, were the views. The two from last week were viewed 5 or more times whereas, the ones I didn’t get were only viewed once.
This isn’t a hard fast rule, but it seems to me that if the audition is viewed multiple times, then whomever is doing the casting thinks the audition is good and has shared the link to others associated with the project. It gives you a little idea of where you might stand with getting the role.