Can I extend the memory with an SD card?

AIR³ has more than enough memory with 128GB of storage. If you need more storage, you can use an SD card BUT after you insert the card, you will be asked if you want to use the SD card as phone storage or as portable storage. DO NOT select Phone storage with data migration! Otherwise, the SD card will be considered part of the internal memory and you will have problems with some applications that may not be able to manage the memory correctly. If you remove the SD card, it will be even worse. You should set up the SD card as portable storage. This will allow you to store your large files on the SD card, but it will not be part of the system.
If you have accidentally selected Phone storage with data migration, go to Settings/Storage and select ‘This device’. Click the 3 dots in the top right hand corner to bring up the menu and select Data migration to revert to the previous state. Then select the SD card, go back to the menu and select ‘Format as portable storage’. Once done, copy all XCTrack subfolders back to the SD card. Contact us for further instructions.