Exporting video to iphone for use on scapchat

So I`ve tried to export my video to my iphone to upload it on snapchat. I`ve tried different presets, some won`t download to my iphone, and the ones who will won`t upload to snapchat.

It just gets stuck at the end of the movie while uploading. I`ve also tried to edit the movie on my phone in an app called Splice, but it gets an error saying it can`t save my movie.

This doesn`t happen with movies that are made using my phone.

Is there any settings that I`m missing?