[Enchanchement] indicate last selected items
its a common behaviour in pc file manager adding a mark/color on last item selected/opened.

would be nice if implemented here as well.
example situation: 1.using material files 2.browsing a bunch of video files 3.switch to fullscreen media player 4.the video is crappy, i want to delete it 5.go back to material files 6.umm... which files is that again, there is no clear indication for previous action 7.you can manually mark via long press or remember the exact file position before switching to another app but this is cumbersome
thanks in advance
That is the focused state on desktop, however most things (except e.g. text field) aren't focusable in touch mode on phones.
If a file or folder is tapped and opened it could be highlighted as if one had used arrow keys or TAB to select that UI element. I guess you would allow a tap to initiate this somehow and keep it visable. Maybe your UI has to initiate it sometimes like when going up a directory and highlighting the folder you just left.