New answers tagged video
The trick was to put the tablet into Airplane mode and then to take it out of Airplane mode again. Unlike just disconnecting and reconnecting the wifi link, this actually unloads and reloads the wifi stack. Since I did this, it plays videos from youtube, iPlayer, etc just fine.
Just change the extension from .gif to .mp4 in your device and forward to anyone. Only thing is that the recipient needs to open it in gallery to see the animation.
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