Cant synchronize/delete folders with hidden files

[Phil1988]

I am synchronizing my android phone two-way (so both sides are always identical when I create or delete a file/folder) to my nextcloud and Windows PC (via desktop client and the app "Synchronize Ultimate).

To make it short:
I found out, that hidden files from my phone (.hiddenfile) are synchronized correctly to the cloud.
But these .hiddenfiles are not synchronized to my PC (on my PC I have the "show hidden files" activated, but they are not there).

If I now delete a folder with at least one .hiddenfile on my PC, then the clients tells the nextcloud only to delete the "visible files" (the ones that are acually only synced to my PC) and the folder is still on the cloud (because it still contains the .hiddenfiles).
How can I make the client to sync also the .hiddenfiles, so that a delete of a whole folder also deletes the folder on the cloud?

Steps to reproduce

1. Create a folder with a hidden file on my android phone (.hiddenfile)
2. Sync the folder to the cloud (in my case via Synchronize Ultimate)
3. Sync the folder to my PC via the latest nextcloud cilent for Windows (v.2.3.3)
4. Delete the folder on my PC
5. Sync the PC folder with the cloud
6. Access the Cloud via a browser and see, that the deleted folder is still there with a .hiddenfile)

Expected behaviour

The .hiddenfile should be synced to the PC and if I delete the folder, the folder should also be deleted from the cloud.

Actual behaviour

The .hiddenfile is not synced the PC, so a deletion of this folder deletes it only from the PC, but as this folder still contains that .hiddenfile, the cloud does not delete the folder.

Server configuration

Operating system:
DietPi

Web server:
(tell me if really needed)

Database:
(tell me if really needed)

PHP version:
(tell me if really needed)

Nextcloud version: 14.0.3

Updated from an older Nextcloud/ownCloud or fresh install: fresh install

Where did you install Nextcloud from: From the DietPi software installer (automated)

Browser: Firefox 61.0.1

Operating system: Windows 7 x64

Desktop client: v.2.3.3

[nextcloud-bot]

GitMate.io thinks possibly related issues are #6092 (Cant delete Folder), #9523 (A file completely disappears after deleting from a group folder), #9594 (Unable to delete or create files), #1071 (Not possible to view files inside of Deleted Files), and #5031 (Wrong or no sizes of files/folders).

[Phil1988]

Ok here is the solution:

1. open the nextcloud client
2. go to the general settings tab and click in the advanced section on "edit ignored files" (or similar.. because its jsut translated).
3. check "synchronize hidden files"