I used to use 1Password when they just sold the application at a fixed price and I handle all the synchronization between machines. That option is no longer available. I'm one of the users who left because of this.
Hmmm , I have a Mac and an iPhone and the fixed price application from circa 2015-16. They are still in sync via iCloud. I can see "Sync with Dropbox" and "Sync with WLAN server" in the settings. Did you mean any custom sync options that may have existed?