Files not copied from cache to store

I am using an Uppy, Shrine and aws-s3-multipart setup on a Rails app and am able to successfully upload files from the frontend to my s3 bucket. However files that are uploaded to the cache folder in the bucket do not get copied to the “store”. Does this require an extra plugin? I saw in a separate thread that this happens automatically with the copyable function but it doesn’t seem to be working for me. Any pointers?