I inserted a video object and added a video file into my video folder, the codec is mp4, the video is around 5 seconds long only. I set the name of the file in the video object but when I load up the project it doesn't show up at all, and it looks like this in the editor.
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You must upload a video in the folder named "Videos".
Then, in the video propieties, there is a text input called "Webm source" You must put the name of the video uploaded like this