You maybe able to validate via AWS CLI get-resources to ensure your source and target are identical. https://awscli.amazonaws.com/v2/documentation/api/latest/reference/workdocs/get-resources.html
Also, i believe transferring the files to S3 and then using the WorkDocs migration utility provides these metrics out of the box.
Checkout the Migration Video that i created for a customer. At around 5:25 mins of this video, the migration workflow completes and it tells you the how many files are updated and how many have failed. https://d1wk4gzilk2198.cloudfront.net/workdocs.mp4
In the past I noticed that when you upload a very large folder (especially if it contains a very large number of files) through the web interface, it takes some seconds/minutes for the total size computation to be consistently updated.
From my experience, you may also want to pay attention to the fact that the web interface is not constrained by path length, whereas Workdocs Drive is. So it may happen that you upload e a very nested hierararchy of folders through the web interface, resulting in not all the files and folders being visible in Workdocs Drive. In that case you have to shorten folder and file names and magically the content shows up in WorkDocs Drive.
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