One may consider using a Gmail 'Send Email' action as you can provide a public URL and create a file object that Dropbox can use. The Dropbox app requires file objects to be passed along during a Zap, and will not download files from a URL.

Uploading a file creates a text file instead of what I expect Unfortunately, our Dropbox integration cannot handle files over 100 MB, so you'll need to try and reduce your file size or move them over to Dropbox manually. This error commonly occurs when uploading very large files. You'll receive a hard-error from Dropbox (and the Zap will not work) as soon as you go over this limit. Right now, you can only watch for new files in a Dropbox folder if the folder has less than 4000 items in it. Folder contains more entries than file_limit (4000) So if a new upload creates a folder and puts a file in it, the zap won't be triggered. Unfortunately this is a current limitation of our integration with Dropbox, we only detect files that are dropped directly in the specified folder when setting up the zap. Files Uploaded to a Subdirectory Aren't Detected

Dropbox download failed forbidden