on Jane Friedman site:

Authors often think of flashbacks as separate, self-contained scenes that serve to fill in essential backstory for characters—and sometimes this can be their format and function.

But this separatist approach is often at the root of why flashbacks can be so tricky for authors to incorporate without pulling the reader out of the smooth flow of the story or stalling momentum, and why they may wrestle with smoothly moving in and out of a flashback.

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