error with uploading mp4 file to CC2014

Hi guys!

I get a very persistent error in uploading a mp4 file to indesign CC 2014, folio overlays to be uploaded in the digital publishing. Once the video is selected from the article folder I get immediately an error triangle in folio overlays: "video file/ streaming URL is invalid...". We have tried everything to solve it, so if there is anyone who has an answer, it would be a miracle! Thank you