Folder sharing should show live contents

I tested the new folder sharing option with some users, and they found it very confusing and cumbersome to use. Here is an example: User 1 saves File 1.1.1 under Folder 1.1 and then shares Folder 1.1. Then, User 2
adds the shared folder as Folder 2.1, and sees File 1.1.1 under Folder 2.1
Now, User 1 adds File 1.1.2 to Folder 1.1, but that file is never shared with User 2. If User 1 and User 2 want to share File 1.1.2, then User 1 needs to share _again_ Folder 1.1, and User 2 needs to save it _again_, so that User 2 ends up with 2 folders: the original Folder 2.1 with 1 file, and the new Folder 2.2 with 2 files.
Every time either User 1 or User 2 make a change to a shared folder, both need to go through this process again.
This behavior is unexpected, because files do not work like that. If a user changes a file and saves it, the user does _not_ end up with two files in the list. On the contrary, the file name is adjusted to point to the modified file. Similarly, the folder entry should be updated to point to the latest modified folder. If this is not possible to do in both directions, at least it should be done in one direction, so that there is a "master" folder that is shared to other users, and everyone can see changes to the "master" folder immediately without having to re-share it.