File Uploads from Local Computer and Google Docs, but no Zoho Docs or Dropbox?

File Uploads from Local Computer and Google Docs, but no Zoho Docs or Dropbox?

At this link:  https://www.zoho.com/creator/help/fields/uploading-files-and-images.html it states "The File Upload field type is used to upload Files in Zoho Creator. Files can be uploaded from your local computer or from any of the supported cloud storage services like Zoho Docs , Google Drive, OneDrive, Dropbox and Box ." But the Browse Options at that page only show Local Drive and Google Docs. What am I missing?