innerfolder
nounUK /ˈɪnəˌfəʊldə/
US /ˈɪnərˌfoʊldər/
A folder that sits inside another folder.
Put the pictures in the innerfolder so they stay with the big project.
OTHER MEANINGS
2. A small pocket or sleeve inside a larger folder for holding loose papers.
The receipt was tucked into the innerfolder of the binder.
3. In computing, a directory located within another directory.
The program saves its settings in an innerfolder named config.
4. A folded section on the inside of a card or booklet.
She wrote a secret note on the innerfolder of the greeting card.