Shared video file over email or downloaded from the link cause video lag during screen share

I have been experiencing issues of video lag during the screen sharing. Tried with both -- Optimize video option checked and unchecked.

However the video lag still persist. The video lag is visible to all participants however the host sharing the file sees it properly on his laptop.

One observation we had, this happens only when the video file is shared over email or uploaded to the drive or even copied from the pen drive/SD card etc.  and then downloaded / saved to the hosts machine.

This downloaded / saved file when shared during live stream causes video lag.

To test this further, I created and copied the actual file on my laptop and tried to share on zoom. -- No issues.

Now I uploaded the file on Drive and used my other email ID to download from the drive, (Verified the file size,FPS rate etc. were not altered) and used this downloaded file on Zoom share. 

The participants now see the lag in the video. No issue with the  audio though. And the host sharing the file also sees perfect video at his end.

Any suggestions or inputs how this can be avoided or pointers on what could be causing the issue?