How validate sourcemaps?

create release

build with sourcemap

use sentry-cli upload maps and it looks success

look it on sentry server

capture a bug

my problem is that how to reference sourcemaps.
Another problem, I can’t upload vendor.js.map(above has removed vendor.js), alway get a error: http-code 413.

witch options should be set?(there r two question)

I’m sorry for my poor english.