it is checked, but when I try to run the flow, it still gives me a popup demanding read/modify/delete permission on shared storage, and clicking Grant does nothing, just like how the checkboxes don't respond.
And I'm not sure what's different from before (I granted it a different way or something), but when I was restoring this flow from a backup a week ago, I got through the permission grants but then I still got file access errors when a block actually tried to access a file. Details of that one are lost though, I'll come back with it if I get to that point again.