PHP Codeigniter - Upload file to Dropbox via HTTPS always empty

[Cross-linking for reference: https://stackoverflow.com/questions/62998138/php-codeigniter-upload-file-to-dropbox-via-https-always-empty ]

We can't provide support for that library itself, as it's not made by Dropbox. That said, it is possible to upload an empty file via the Dropbox API, so it sounds like this code isn't successfully retrieving the local file data to upload when running on your server, and so is issuing the upload API call to the API without any actual file data, resulting in the empty uploaded file.

It looks like you're specifying the local file via the '$pathToLocalFile' parameter, so to troubleshoot this you should make sure that that value is what you expect, and that the path refers to the right file locally on the server, and that your code has the ability to access that path.