Can I use my Interfolio account to submit recommendation letters?

Yes, and it's easy to do!  When you apply in ARIeS, instead of your reference provider's email address, you will enter the document email address from the recommendation letter in your Interfolio account.
When ARIeS sends an email request for a recommendation letter, it will go to Interfolio, not the reference provider.
For complete instructions, visit the Interfolio Help Center.