MOV video format doesn't work with Safari and Quicktime plugin unless the video has been loaded in other browser e.g. Firefox or Chrome with Quicktime plugin.

Basically, Quicktime plugin is properly used by Firefox or Chrome to play embedded video in Confluence but not Safari.
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Actual: as I understand the MOV does not work. It means that it shows a QuickTime Logo in view page and just happens in Safari. It is not the same as the bug "CONF-34335". "CONF-34335" mentions about video is cut off - do not show video controls, progress bar in almost browsers.