A free program for Android, by CMP-Soft LLC.

PhotoGuru Media Player is a media app that presents photo and video files from a variety of media hosting sources like Dropbox, Flickr, Google Photos, SmugMug, WebDAV, Zenfolio, Google Drive, and more. 

The user interface is easy on the eyes, with controls that are intuitively designed and place so that you are provided with a sleek and inspiring environment for your multimedia presentations. 

PhotoGuru is compatible with Amazon’s FireTV media player, and Google Android TV devices. For FireTV devices such as FireTV 4K and FireTV Stick 4K, plus NVidia Shield, true 4K/UHD image rendering is supported.