Add a gif to the diapositive of minimal theme

New Member
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Hi there!

I was trying to add a gif for a diapositive but without success. 

Then i've looked on internet and saw that  you have to do it manually cause the theme doesn't accept it. 

But i'm a total new comer so i was wondering where is the line where i need to add the URL manually? 

Sorry for my bad english and i hope someone can help me!

Thanks you and have a nice day!