My cloud Os 5 android app can't stream hevc Mobile video file

Hi, I’ve an Ex2 ultra with latest os5
With android os5 app I can’t stream video of my oppo find x2 lite
Video type: hevc aac .mp4

I see a message: ‘‘this file audio format is not supported’’

How is it possible?
no problem with other video from other Mobile phone: h264 aac .mp4

Thanks for your support