I am posting a video. I upload that video. This is 4 meg.

I am posting a video. I upload that video. This is 4 meg. It is a .mp4 video. I upload it and then I have status showing me the preview of the video which I can play right there. I post it and then here is what is happening: It post a link stating it is not supporting. As follow : Not supported
Obviously that links play and is supported by wp. Note that in the setting I have checked the: Simple HTML5 video support.
Then the next thing is this. When I post a youtube video with author user status using the url media posting option of the wp media library again Status display the preview youtube video but when posting it strips the code off.
Please let me know how to solve these issues. Thanks.