Ok, so I was stuck and cannot figure out for the life of me how to get my dropbox-sync'd opvault file into the 1Password Alpha for Windows Modern.
I've followed the instructions in this article - https://discussions.agilebits.com/discussion/39874/getting-started#Dropbox-primary.
However, whenever I get to Step 4 (On the "Manage vaults" page, scroll down into the Dropbox section, choose the vault you want to use as your primary vault, and slide the corresponding switch from OFF to ON.), there is no vaults listed for me to use.
After waiting the better part of ten minutes, which was the time it took me to find the aforementioned article, register on the support forum, validate my account, and start process of writing this post for help - the password vault finally appeared for me to select.
So, bit of feedback obviously - would be nice if it showed up immediately after connecting the Dropbox account, or gave better signals that it was still locating your opvault.
1Password Version: 5.3.2
Extension Version: Not Provided
OS Version: Windows Phone 8.1
Sync Type: Dropbox