Try
After selecting a block of text, press Shift + i or capital i .
String i will not work.
If this does not work ...
Check if you have +visualextra in your version of Vim.
You can do this by typing :ver and scrolling through the list of functions. (You might want to copy and paste it into the buffer and perform an incremental search because the format is odd.)
The inclusion of this question is beyond the scope of this question, but I'm sure you can find it somewhere.
ovatsug25 Sep 13 2018-12-12T00: 00Z
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