Watching a video on your phone is pretty easy on both iOS and Android.
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First off - you need to install a video player app that can handle various video formats. Head over to the AppStore og Google Play and install VLC Player. It'll play all kinds of video/audio files.

Then, head over to the Filemail download page. You will be asked to install/open the Filemail App. After opening the Filemail App - then click on the SAVE icon in order to save the video file(s) to your device.
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After the video file has been saved - OPEN it in VLC Player (from the Filemail App).