I created a gif which is nearly 1 minute long. After 30 seconds, the GIF started running. 

Hi,

This happens when you upload images from your computer that are very large in size.  Try reducing it to a max of about 50k and retry.  It should work.  We are also working on doing this in our software but in the mean time this is the work around.  Also, gifs are not designed for long animations.  Best is to limit it to 30 seconds.

Thanks for bringing this to our attention.