Data Transfers · Setting up a transfer
What does “No subfolders here” mean in the cloud folder browser?
Short answer: The current folder has no folders inside it. The browser lists folders only, not files, so a folder full of files still says this. Click Use This Folder to pick it, or Refresh if subfolders were just added.
The folder you're in has no folders inside it. The browser only lists folders, because you're choosing where a transfer goes or comes from — files inside aren't shown, so a folder full of files still says this.
To use the current folder, click Use This Folder. If you expected subfolders, click Refresh in case they were just added elsewhere.
Related: Pick a folder inside a cloud account · “Could not list folders”