TMS Software has a massive cloud API component suite for Delphi XE8 Firemonkey called TMS Cloud Pack for Firemonkey. There are at least 33 different components that interface with Facebook, Twitter, YouTube, DropBox, LinkedIn, Google, Amazon, Foursquare, Instagram, PayPal and more. These components work on Android, IOS, OSX, and Windows. One of the examples that demonstrates the component suite allows you to create folders, upload files, download files, and delete files with DropBox, Google Drive, Windows OneDrive, and Box. With the PayPal component you can implement payments in your apps too (as long as you aren’t publishing them through the Google or Apple where they have payment provider restrictions). In addition to all of the different cloud APIs it offers a component called TTMSFMXCloudImage which will load an image from a URL and supports BMP, PNG, GIF, ICO, JPEG formats. If you are looking at interfacing with any of these APIs from within your app this component suite looks like a huge time savings. This is a commercial component suite but there is a free trial available. You should also be able to use the components with Appmethod with a few minor tweaks to the package.
Head over and check out all of the different features of the TMS Cloud Pack and download the free trial.