Idea of Add File Icon
This icon looks like a piece of paper, but the top right corner has a single fold toward the center as if someone has just turned over the edge with their fingers and in the bottom right corner there is a 'plus sign' inside a circle.
This Add File icon is made in Material Design style
developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,100 icons, all in the same style and quality.