in tray
noun [ C ] UK uk/ˈɪn ˌtreɪ/ us/ˈɪn ˌtreɪ/ (US inbox)
（办公室内放来文来函用的）收文篮
a flat, open container where letters and other documents are put when they arrive in a person's office and where they are kept until the person has time to deal with them
Just put it in my in tray and I'll look at it later. 放在我的收文篮里吧，我稍后再看。