KyPass v3 have a bug… You couldn’t add webdav url and change dropbox folder with this version.
It’s fixed in v3.0.1 and… it’s already in review.

The status for the following app has changed to In Review.

App Name: KyPass 3
App Version Number: 3.0.1
App SKU: 112
App Apple ID:536560380

Sorry for the bug.