ファイル
ファイル · fuァiru · JLPT N1 · noun
file
📁 ファイル is katakana for the English 'file'; say 'fai-ru' and think of a manila folder labelled FILE
Loanword from English 'file', so the sound is close to the English word. Its extra meaning, 'portfolio', comes from the same sense of a set of papers kept together.