before getting videos to samsung windows phone, you have to check whether your video formats are supported by it. If not, you should have to convert video files to MP4 format (MPEG4, AAC) compatible with your Samsung phone.
there is a freeware to convert video to mp4 for samsung windows phone for windows users.
And a shareware for windows users:
But if you are a Mac user, you have to use Mac version:
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