Multi-selection via guesture

[k3b]

Possible app inprovement. Idea originated Idea from From https://www.reddit.com/r/androidapps/comments/g7o0di/is_there_a_galleryfiles_app_that_allows_multi/

[A gallery app that] allowed me to select multiple files without having to tap on each and every one of them by simply flowing my finger consistently on the selecting square.

It was extremely handy cause I could select more than hundreds of items in the matter of seconds.