What does “along the line” mean?

at some point during an activity or a process

How is “along the line” used?

In Signed, Sealed, Delivered: The Vows We Have Made (2021), one line is: “I'm afraid that somewhere along the line,”

The clip at the top of this page is from Signed, Sealed, Delivered: The Vows We Have Made (2021).

I'm afraid that somewhere along the line,

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