If you originally obtained from Play, stick with that. It should appear to you within a few days. It sometimes takes that long for Google to populate to everyone.
I don't know if a way to force play into searching for and updating apps already installed.
Alternatively, you can download from DJI's site and sideload the APK. However then you might not get notifications from Play in the future.
I thought the app itself had a way to check for updates but at least for version obtained from Play, it seems only firmware and flysafe database can be checked for updates on demand.