miguelromm
If you are using the official video plugin and is failing the first thing you need to do is find out what is causing the issue and open a bug Report.
You can do this very easy by creating an empty project and adding the Official video plugin alone and the video that is failing, export as you do and test, then if you still can reproduce the issue open a bug report and give them the demo project.
Here:
https://www.construct.net/en/forum/construct-3/general-discussion-7/report-bugs-amp-post-128538
Also, make sure to test in the last version just in case the bug has been fixed.
If you cannot reproduce the issue in an empty project then it must be something else interfering and causing the issue which can be anything as you have many plugins in your project so you gonna have to remove one by one until the video stops failing so you know what plugin is causing the problem.
One thing I don't understand is why you have that Youtube plugin in your project if they told you that is not compatible with the C3 build service so you may look into that as the second option. Other than that you gonna have to keep testing until you find the source of the problem.
Thank you for your answer, tarek2. I've tried on a new and clean project and happens the same problem, so it could be a bug of Construct 3 :/
Empty project without non-official plugins:
https://we.tl/t-wib2hZD63N