On the Android app, in the section “Vocabulary” (where all your LingQs are listed), it’s possible to manually add LingQs but often the app will prompt me that I need to upgrade in order to do so even though I am a logged in premium user. Sometimes, it will work right away.
Zoran - This is the same issue that I reported a few months back. Still happening on my Android app. It’s annoying but I decided to wait for 5.0 to see if it gets resolved.