Missing bank transactions

SUGGESTED

Hello, we have only just had bank feeds installed on 19-th December 22’ and I am a little disappointed in the fact that I can not see any bank transactions being downloaded from 1st December. How can I reconcile bank to sage not having any transactions available to be matched with sage between the period of 1st December and 18th December. I’ve matched all bank transactions to sage from 19th December but I now have no transactions in the bank window left but plenty of transactions in sage window. Do I just post all missing bank transactions manually? That will be 18 days of bank transactions! What if I was to try and download the whole month of December bank transactions? Is that going to cause me an issue with those transactions that I have already matched? 
thank you 

Margaret