George4Tacks
Level 15

e-file >E-file support tools > View E-file > Go to +OR and the first thing you see is

<?xml version="1.0" encoding="UTF-8" ?>
- <ReturnState xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" stateSchemaVersion="ORIndividual2020v2.1"
Which translates to Send irs efile; send ORIndividual2020v2.1 
That is send fed with State. You can see similar schema for each state.

Here's wishing you many Happy Returns
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