We appreciate you allowing us to share your case as an educational opportunity for our staff.

這個句子中，關于allowing us to share your caseas an educational opportunity for our staff，假如把這個動名詞短語理解為一個句子的話，那樣as短語作方法狀語，根據語法規定狀語應該飾謂語動詞，所以as短語應該修飾allowing。但我感覺，好像在邏輯上as短語修飾的是allow的賓補share，這就產生了沖突，所以as短語到底修飾的是哪個呢？為何會是修飾賓補呢？

to share your case as an educational opportunity for our staff.

黑體部分是修飾不定式to share的方法狀語。整個劃線部分為不定式短語，作allowing的賓補。