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It's all about context. I don't think there's a blanket answer. An Occurrence at Owl Creek Bridge is, in a sense, a flashback in the middle of the story, but it works exquisitely.
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/6156 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/6156 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/