Problems with sync interval (might be related to external storage scanning?)

[schaetzlein]

Hello together! :-)

I have problems getting the Sync Interval to work as I would like it to.
I have adjusted the settings according to the following doc: https://docs.nextcloud.com/desktop/latest/advancedusage.html#configuration-file

The [Nextcloud] block with the following values has been added to "%APPDATA%\Nextcloud\nextcloud.cfg
" between [General] and [Accounts]:

[Nextcloud]
remotePollInterval=30000
forceSyncInterval=600000
fullLocalDiscoveryInterval=300000
notificationRefreshInterval=300000

The sync should be forced every 10 minutes like that. But I seem to get changes to the directories randomly..

Is it possible that the sync interval actually works correctly, but no changes are made because the folder sizes are not calculated in a reasonable time?
(The folders I am talking about have been added via "External storage" as "SMB/CIFS".)
See screenshots:

Once I log in via Webinterface and go to the overview like in my second screenshot the folder sizes seem to get calculated in the backgrund and then sync client also works like intended.

Shouldn't "remotePollInterval" trigger this folder size calculation also? (If this is the issue for sync not to work correctly..)

Maybe someone can help me understand this issue better..
In the meantime I will try to get folder size calculation happen more often.
Maybe someone of you has the correct cronjob to achieve this or is there another way to do this? :-)

Any help is appreciated and thanks in advance!