However, here, no contact pictures are synced. When a contact is changed on the phone, I get the “broken contact” flag from Nextcloud, see Contacts app - sync contact pictures which is closed, but not fixed.
Any idea what can be the problem with the pictures?
Ok, I use an app called WhatsApp Contact Photo Sync to set the contact pictures from the WhatsApp profile. I’m not sure how it saves the pictures, but also when I edit a contact on the phone, the picture set from this app is not shown. However, when I set a contact picture from the gallery, it works and is synced properly.
So the problem is caused by your 3rd party contact photo sync app, that’s fine. If you want to debug the problem, you can export a contact where a photo is not displayed to a vcf file and check its content with a text editor. The line of interest is starting with the key word “PHOTO”.