We appreciate you allowing us to share your case as an educational opportunity for our staff.
这个句子中，关于allowing us to share your caseas an educational opportunity for our staff，假如把这个动名词短语理解为一个句子的话，那样as短语作方法状语，根据语法规定状语应该饰谓语动词，所以as短语应该修饰allowing。但我感觉，好像在逻辑上as短语修饰的是allow的宾补share，这就产生了冲突，所以as短语到底修饰的是哪个呢？为何会是修饰宾补呢？
to share your case as an educational opportunity for our staff.
黑体部分是修饰不定式to share的方法状语。整个划线部分为不定式短语，作allowing的宾补。