I have used PE pro for years on my iPhone. Very happy with it despite some ui quirks that require getting used to. However I recently tried importing all my data into a new iPad. The best option seemed Pocket Earth archive to me, so I exported all my data on the iPhone to the iCloud Drive.
When trying to import this data on the iPad, I can see the file on my iCloud Drive and select it, but then… nothing, there is no import button or command, the file just sits there and can be selected and deselected, but nothing gets imported. Rather disappointing!