Internship Recommendations - Where do they go?

<p>Hey Guys</p>

<p>I did two internships this summer, one in Merrill Lynch and one at IBM. I am getting letters of recommendations from both internships, but I was wondering where do I send them too? Do I upload them on the commonapp at the end where it says to upload any additional documents? Or do I send them to all the schools I'm applying to by mail? Should I send the letter of recommendation, or the actual research project I did for both the internships? Which would be more effective? Thanks</p>