Firstly, it may be a network issue, a disconnected network or unstable internet speed during the download process may lead to a failed download.You can try to redownload or adjust your network settings, or try using other download methods.
Secondly, it may be that there is a problem with the appleCMS secondary development tutorial video resources.For example, the resource link is invalid or cannot be accessed normally.In this case, you can contact the resource provider or seek other channels to obtain the required resources.
Finally, it may also be because your device or browser is not compatible with the tutorial video resource.You can update the device or browser version, or download using another device or browser.