How to save a video on dropbox to my iPhones camera roll?

I'm trying to get my videos onto my phone and texting and emailing them aren't working so I'm trying dropbox but I don't know how to save them. I know you have to favorite them but the save to camera roll option after is no where to be found. And it hasn't automatically saved them either. Can someone please help me this is very frustrating.

Download and install Handbrake from www.handbrake.fr

Get the video on your computer. Use Handbrake to transcode/convert the video to an MP4 your iPhone/iPod can deal with using the presets in Handbrake.

Launch iTunes. Drag the converted MP4 to the iTune Library. It should save to the Videos section. Sync the iPhone with iTunes… Be sure the video sync is set up right.

Camera roll is used for storage that the iPhone uses when the iPhone captures the image or video - not from external capture devices.

If you do it correctly, the converted file will be accessible from the "Videos" button of the iPhone.

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