Universal Credit question

Hi, I was asked by the Universal credit review team to provide proof of rent payments and first they asked me if I had any receipts from the landlord. I said that I wasn't sure so they told me to send them bank statements showing the rent payments instead. After the call I actually found the receipts from my landlord and asked on the Journal if I should upload them after all. It's been a few days and I haven't got a reply yet but I would feel more comfortable sending the receipts instead of bank statements. Did anyone have to provide such proof and uploaded receipts? I am a little confused as to what I should do; wait for a reply or just upload already what I was asked for at first and feel more comfortable with. I got a 2 week deadline by which I need to send all the documents they asked for. At the same time they wrote on the to-do list already that I should send them bank statements and I am wondering if they will find it strange that I send them something else instead?