Adding Gif to Rise: Unexpected token < in JSON at position 0

I'm having issues inserting GIFs into Rise. Some work, some don't. I've read the blogs and tried the suggested fixes (i.e . restart browser, clears cache, file size) nothing seems to work. Some work and some don't. 

 

The error I get is: Unexpected token < in JSON at position 0

Any help you can give me would be greatly appreciated. 

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