Why is it that when i insert Video-Urls correctly into the Video-Tag, some Videos can shown and other not?
Hello @board9615242703, welcome to the forums! I imagine, if you are doing everything correctly, it is just due to permissions on the video (in terms of sharing, copying, things like that) or whether or not the video actually exists at that location. (There might be a matter of loading, but that seems a bit unlikely).
I hope this helps!