Adding a user to an existing group doesn't show previous shares

Hi Everyone

Nextcloud version: 15.0.5
Operating system and version: Debian 4.9.144-3.1 (64-bit)
Apache or nginx version: Apache 2.4.25
PHP version: 7.3.3

The issue you are facing:

i’ve created a group and added some users to it. One of the users, which i made group admin, shared some folders with the group and everything went fine.

Now i received a mail from a reently added user to the group reporting he doesn’t find any folder shared with him on his account.

In order to replicate the problem, i added my admin user to the group, relogged to Nextcloud and didn’t find anything shared as well

Am i getting it wrong? i mean, i thought that folders shared with a group should be visible to all group members even if they are added after the folder is shared with the group. If that is not the case, how can i manage it? Has the folder to be shared again with the same group?

Thanks for all your answers in advance

Kind Regards

Enrico Drusiani