There are standard rules of application to which you may refer to: https://www.gov.uk/settled-status-eu-citizens-families. However, there are nuances, for the residents who lived in the UK for a long time and may be applicable to you as well.
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What would be the process to apply for EU Settlement Scheme after June 30 deadline?
I'm a Spanish entrepreneur with a long-term partner in the UK. Would I be able to apply for EU Settlement if for some reason I miss the June 30 deadline?