How to integrate Amazon S3 into Microsoft Access

I am supporting a well established Microsoft Access application. I have previously written a separate VB.Net application to backup the database to an AWS S3 Bucket. But I would like to integrate this backup routine into the MS Access code (VBA). If I try to add the dll's (AWSSDK.Core.dll & AWSSDK.S3.dll) from the VB.NET code as References to the Access(VBA) it fails "Can't add reference to the specified file". In Access terms References as Type Libraries. So where can I find a Type Library which gives S3 functionality to some VBA code?

Many thanks