What's the purpose of filing an I-131 along with I-485 and I-130?

Wondering what the optional I-131 is meant for while the 485 and 130 are being processed?

Person applying for AoS is already in the US in our case.

submitted by /u/Firm_Bit
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source https://www.reddit.com/r/immigration/comments/rvzrqe/whats_the_purpose_of_filing_an_i131_along_with/

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