fill me in

fill me in (tell me the details, tell me more) — просвети меня; введи в курс дела; расскажи поподробнее

fill sb in (on sth) (inform someone about something)

Example: Can you fill me in on what happened while I was out this morning? (= tell me what I missed )

Example 2: I couldn't attend, so will you fill me in? (Heritage)

сf.
[keep me in the loop]