Videos suddenly disappeared from Android Samsung S7

So my mother asked me to download a video online, which I did. It was a youtube video which I download using other application. I've used the application for a long time and quite trust it despite sometimes its not reliable.

Anyway when downloading I was not paying attention and apparently my Portable wi-fi was losing its battery and the internet got cut-off. Naturally the download failed, but I didn't know that. My mother told me the video cannot be played when she play it, so I checked...

Videos suddenly disappeared from Android Samsung S7

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