How to upload slo-mo videos?

I have a big problem when I record with my iPhone 5s with the feature of the slo-mo when I want to upload to Instagram, Facebook, Vimeo, or sending on WhatsApp it appears like a normal video not as a slo-mo video. The ones that have iPhone 5s and use the slo-mo could help because I have seen people uploading from their iPhone 5s to Vimeo or Instagram in slo-mo without any problem.

Is your video too long or too short?

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