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As you knows, any video used in a Solvay website is managed within Keepeek (see Manage Media management). When a video is stored in Keepeek, it needs some time to be converted it in the format expected by the website (approximately 1h / 100Mo). An error could occurs during this conversion job.
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If it finally still does not work, please contact the web support, providing the concerned page address and explaining which actions you took to try to solve the problem (Web support contact).