OTCAS letter of rec

Hi everyone! I have four letter of recs but I didn’t realize that you can’t rearrange the order of the letters. Some schools state that they would only read the first three letters but what if my most important letter is the 4th one? Can I pick which letters to showcase somehow? Thank you!!
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Occupational Therapy [ O.T.D. ] Source Type: forums