What works for me using my synology NAS:
DS drive desktop app sync task between desktop photos folder and synology photos folder
DS drive android app sync task with photos folders (camera roll, screenshots, etc) and sub folders of my choosing within synology photos folder (I find this better than the photo backup option in DS Photo app).
Make sure the DS drive android app is not syncing to the actual photo folder as you will duplicate your entire synology photo directory to your phone.
With this setup all phone photos sync almost instantly to desktop and if you use the DS photo app to move cameral roll, snapshot, etc photos to other folders it will then sync and remove it from phone, unlike the DS Photo backup option. Not exactly like apple but I'm happy with it.