Log in to an external site and then return to the experiment \ preload all the videos before experiment

Hi everybody,
I am running an experiment that includes a lot of videos.
In big part of the videos (all videos up to ten seconds) I have a significant delay between video and it’s sound. It changes between different computers so I’m trying to find an alternative solution,

Is there a possibility that the participants in the experiment will click on a link, watch the video on an external platform (for example - YouTube) and then return to the experiment? And if so, how can this be done?

If there is a way to preload all the videos before starting the experiment, it can also help me solve the problem

Thank you,

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