I have both versions, but i use Discogs Collection (PC) to copy matrix / runout to web version.. Cut and past i pretty easy, but I seem not to be able to activate ‘sync’ from web.. I need to open mobile and press sync.. Is there a technical reason for that the sync can’t be activated from web (PC) ? Just now I live with it.. 
CLZ Music Web is cloud-based software that operates DIRECTLY on your CLZ Cloud. Every change you make is instantly saved to the CLZ Cloud. So you never have to sync there.
On the mobile app, you need to sync with CLZ Cloud to retrieve the changes that you made in the Web software (or to upload changes that you made on the mobile app).
Is there a technical reason for that the sync can’t be activated from web (PC) ?
Well many reasons actually:
- what would it sync with? The Web software has no knowledge of your mobile devices. And you could have multiple.
- How would that work? A website is not able to somehow push data to your mobile device.
- What if your phone is switched off or not online?