Take screenshots and store them in local memory. Download them automatically or at a later date.
ScreenShot Manager is made to store multiple screenshots in local memory for later use.
Shots by default are downloaded automatically to the downloads folder.
You can change this in the settings and have a dialog show which will ask you were you would like to save it.
Alternatively you can just store them in chrome local storage , view them from the app and download them at a later date.