For the past three years I was using Pcloud to sync my zotero library across devices. It provided 10GB of free space that was more than enough for all of my documents. But since feburary 2022, pcloud ended support for webdav sync and thus now we can not sync our library between office and home system.
The solution - Box.com
Box.com is a service similar to pcloud that offers 10GB of free space. Follow these steps to setup box.com for zotero on MAC, Windows and Ipad
Make an account on Box.com
Goto Zotero → Preferences → Sync
Under file syncing choose WebDAV
Enter your credentials for Box.com in username and password
For windows and ipad follow the same process. Now, you can enjoy free sync of your complete library between devices.
If after changing your WEBDAV server your files are not syncing then goto Zotero → Preferences → Sync → Reset. Choose the radio button Replace Online Library and hit Reset.
Caution: The above process will overwrite your online library with your local library. Use this option wisely.