Re: copy entire dropbox to onedrive for business
Hi @chriffle,
You could use the following method to transfer files, but there are a lot of restrictions.

First of all, if it include a subfolder, we can't get the files contained in it, so we can't get all the files.
In addition, if the file size exceeds 100M, it will exceed the Flow limit, and the execution efficiency will be very poor.
You could consider using Dropbox client to sync files to your local computer and upload the entire folder to OneDrive for Business.
This also keeps all file directory structures.
Please take a try.
Best Regards,