I had a lot of trouble locating the app data for SkySafari 6 Pro V184.108.40.206 on a Samsung Galaxy S9 Android phone running V10 (with the latest updates as of March 5th 2022).
I wanted to add a horizon panorama to the "Horizon Panoramas" folder. I had previously found this folder on the <SD Card>/SkySafari 6 Pro/Panoramas/. But now that folder is noo longer used - ie just an old folder that never got deleted with some update. There is an old folder on both the phone internal storage and the external SD card storage.
So i uninstalled SkySafari 6 Pro and then deleted the internal and external SkySafari folders. I then reinstalled SkySafari 6 Pro. The skysafari folder never should up on the top level of the internal storage. There is no longer an option to install an app directly to the SD card.
I eventually found the SkySafari data at:
I copied my new horizon PNG file to the above folder, and it did show up in the list of SkySafari horizon images. So that was good!
I then tried to move the SkySafari app to the SD card since there is more room on the card for the 2.2GB of data. I used the android settings/apps/skysafari 6 pro/Storage settings to move the data to the SD card. The phone indicated the data was transferred to the SD Card. But when viewing the file folders (from a PC or with the android files app), the data still resides on the internal storage. So there is a bug somewhere.
So a lot has changed with the latest android version. The help on installing a horizon png file needs to be updated. Also, there appears to be a problem with moving the data from the internal to SD card storage. The phone reports it as moved, but the files are still on the internal storage. So installing a horizon panorama on an app supposedly moved to the SD card, still has the data residing in folders stored on the internal memory.