@Siamak @Konstantin_Boyandin Exact same behavior on my local install. But this affected me already before 1.5.7 - you can find multiple posts on this forum. My “workaround” is to always open the sub-folder in the GUI which then suddenly detects all folders and files and syncs them. It is so frustrating that this software is not able to deliver on it’s one core functionality that it is supposed to do well since more than a year.
I still put up with that because this manual workaround sadly is still more convenient than downloading/syncing files from the browser directly.
If there was any real alternative for Linux I would switch in a heartbeat. Sadly the alternatives do not (yet) support team shares.