Dear Yumiko,
Thanks for your detailed video, I already viewed it. I have checked again, and see that Export dropdown on the top doesn't works, you'll have to use Export dropdown on the bottom. In the previous time I check with your website, I use export dropdown in the bottom. lol.
We'll fix this bug and release a patch in the next version. Currently, just use Export in the bottom.
Cheers!
Tan