Be sure to link your passport to your eVisa

I set up my eVisa several months ago using my BRP number.  I just learned I need to link my passport to my eVisa so that when I travel internationally the airline can send my passport number and UK immigration can check my immigration status.

Maybe this was mentioned in the emails from UK immigration, but I missed it.

Here's a link to update your account details on the UKVI website, which allows you to upload a photo of your passport.

https://www.gov.uk/update-uk-visas-immigration-account-details/update-your-ukvi-account

The system kept saying it couldn't read my document, but there was an option to upload it and have them do a manual check.  I did that, and 3 days later I received an email saying my document was added to my account. 

Here's a link to a Youtube video that has some additional information.