Hey @Robm, from reading OneDrive Upload > 4mb, the 4 MB limitation is down to the API endpoint used by n8n. You might want to leave a vote on that feature request to support larger files in the future.
With this limitation in place it would currently not be possible to upload files larger than 4 MB, even if previously downloaded from Google Drive or Dropbox I am afraid. Even apart from this limit you might want to consider more specialized tools for syncing different cloud storages. An example would be rclone which I have suggested here: