Cannot see new file name during upload

Uppy
1

I am using this code to modify the file name before upload:

onBeforeFileAdded: (currentFile, files) => {
        const modifiedFile = {
            ...currentFile,
            name: `${currentFile.name}__${Date.now()}`,
        }
        return modifiedFile

Using this I can see that the filenames have indeed been updated.

    onBeforeUpload: (files) => {
        console.log('updated files', files) // files here have `new-name` and empty `data`
    },

However in the XHR request I cannot see the new names anywhere? How can I see the modified names for the files on the server?