I've learned that "。。。" is incorrect in Chinese punctuation (see e.g. Chinese ellipsis marks), it should be "⋯⋯", called 省略号. I've just been copy/pasting this into my documents so far, but there's surely a better way to do this.
I'm using Google Pinyin IME which is fairly standard, I think. (If relevant, my operating system is Linux Mint.)
Question: How to type the Chinese ellipsis ⋯⋯ using Google Pinyin IME?
I didn't find an obvious answer by searching
google pinyin ellipsis.