Select multiple (or single) item(s) to perform bulk actions :

Context :
Today, to perform these actions on documents :
add to favorites,
start a workflow,
Add to a collection
Users should access to the document detail view, or swipe on items one by one.

Goal :
To enable users to perform actions on more than one item at once, we should enable a "select" mode to choose one or multiple assets, and give the option to perform actions on this selection (typically : adding them to a collection).

Expected result :
Example user story : As an user, I can search for all assets with "pdf" in it, select several of them, and add them to a new collection named "my pdfs".