How to upload file via Curl with Binary object input?

karanag In your code, you're sending the data in your 'content' variable, which just contains the string '"@" + imagePath', not the actual file data at that path. In the examples in the Dropbox API documentation, the "@" is a way of telling curl on the command line to read from the local filesystem at that path. That wouldn't necessarily work in other environments, such as using XMLHttpRequest like you are here. You'll need to update your code to pass in the actual file data. Please refer to the documentation for your platform for information on accessing file data.