How do I upload a PDF file with Swiftly Dropbox

The type of file shouldn't really matter. This works for me:

let data = try? Data(contentsOf: URL(fileURLWithPath: "/local/path/to/test.pdf"))
if (data != nil) {
    DropboxClientsManager.authorizedClient!.files.upload(path: "/test.pdf", input: data!)
    .response { response, error in
        if let response = response {
            print(response)
        } else if let error = error {
            print(error)
        }
    }
}

If you're still having trouble, please share your code and the error you're getting.