Does UCB require high school transcripts of transfer students?

When you transferred to UCB (or other UC), did they require you to submit your high school transcripts?
I attended 2 high schools outside of the USA, so it would be a lot of hassle to mail them to UC.

They requested them of me.

All of the UCs request both high school and college transcripts once you have accepted your offer of admission.

From the UC admissions website: “Admitted transfer applicants:
You will be asked to submit official transcripts from all schools and colleges you have attended, including high school, regardless of your length of attendance or whether you believe the credit is transferable. Some campuses may request transcripts prior to admission.”

https://admission.universityofcalifornia.edu/how-to-apply/applying-as-a-transfer/after-you-apply/transcript-submissions.html

There is more info for students who went to high schools outside of the US at the bottom of the page for which I have linked for you.