While posting into the E-learning Sites: 
Most of the part is described in the image itself that what should be kept in mind before posting any video for learning purpose. It should not be long length, size of video should be low, it must be well prepared and edited and the most important is that the video should have the exact course content. Here are some more valuable points discussed for a good video post. Thess are as follows:

1. Video length can significantly affect engagement. Shorter videos are much more engaging to learners. Invest in production lesson to segment videos that are no longer than 6-7 minutes in length, if possible. 
2. Videos where the instructor looks directly into the camera with slides are more engaging than slides alone. Invest in post-production editing to display the instructor’s head at opportune times in the video.
3. Videos produced with a more personal feel could be more engaging than studio recordings. In videos where there are few slides and more video of the instructor’s talking head, try filming in an informal setting related to the subject matter of the video (i.e. office, lab, in the field, etc.) instead of a formal production studio.
4. Videos where instructors speak fairly fast and with high enthusiasm are more engaging (especially for instructors who's native language is the same as the language of the course). The pace can be accelerated compared to conventional face-to-face lectures. 
5. This also has the indirect positive effect of keeping video length shorter. During production, consider removing some speech pauses including “umms” and “ahhs” if they are present too frequently. 
6. Clearly number the “step” in the process as the process develops so that students can easily orient themselves in the tutorial video when they re-watch relevant parts. 

Do you find them relevant? If you have any other opinion discuss it in the comment. Thank You.