Missing documents for OPT filing

I sent my OPT application but then I realized I sent USCIS two passport photos (UK passport size) which did not meet the US standard. So the questions are:

  1. Should I resend them with two correct sized photos and one letter explain my mistake?
  2. Does missing photos lead to application is rejected?
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Probably you’ll get a RFE. We cannot send any documents post our initial mail unless asked for. I received this response from USCIS when I called them to see if I can send the missing I20 copy.