I would to know of there is or someone would like to make it.

An app were I can download and store an emailed attachment, in example if I get an emailed pdf I would like to store it on my phone and pull it up later. Then maybe extract it with SSH later. Also would be nice if those files could be reattached to an email. Don't know if this is even possible.

Kinda like a photo library type put for other files.

I like to use my phone at work and I sometimes get sent pdf and other document types. I use a PDF file for a parts list and have it saved on my email, but I get 5+ emails a day at work so scrolling down is never fun.