Literature folder on my computer is 47mb however mendeley says I have reached my 100mb upload limit

I am currently uploading and sharing files in a private group. According to my computer the total size of the folder where the literature is kept is 47mb, however when uploading to mendeley it says I am at 97mb and I can not upload any more. Any advice on how to fix this? I have checked for duplicates. Is there a way to unsync and delete all files uploaded to mendeley and then re-sync them all?