Hi there,
It seems like Google Chrome does not play .mp4 files on Confluence. I have tried every possible video format (.mp4, .ogg, .avi, .wmv, .ogv, .webm) and with the appropriate codecs however, none of them work.
These videos are large (over 10MB in total) and stored in Nexus Repository Manager 3.0. When we asked Nexus to see if there's an issue from their end and they said it has to be with Confluence (no help). I can view Vimeo/Youtube videos and both {HTML tag amd multimedia tags can be used for them, however, nothing seems to work when it comes to .mp4 videos on Chrome! I checked many forums on this topic on Atlassian and the web, but could not find a solution that works 
Current Confluence Version: 6.7.2
Current Google Chrome Version: 71.0
Notes/Summary:
1. Due to security reasons, we cannot use any public platforms including Vimeo/YouTube and can only use Nexus for hosting.
2. We can only use Chrome to view the videos.
3. Larger files so attaching to Confluence site is not an option (increasing Confluence space size is not an option either) .
4. Can use Nexus only as a hosting platform.
Please help!
Thanks in advance!