DJI no longer support the ipad
mini 3, you can see a full list of supported devices here:
iOS V4.3.3
Requires iOS 10.0 or above.
Compatible with iPhone X, iPhone 8 Plus, iPhone 8, iPhone 7 Plus, iPhone 7, iPhone 6s Plus, iPhone 6s, iPhone 6 Plus, iPhone 6, iPhone SE, iPad Pro, iPad, iPad
Air 2, iPad
mini 4.
Optimized for iPhone X.
Android V4.3.2
Requires Android 5.0 or above.
Compatible with Samsung S9+, Samsung S9, Samsung S8+, Samsung S7, Samsung S7 Edge, Samsung S6, Samsung S6 Edge, Samsung Note 8, Huawei P20 Pro, Huawei P20, Huawei P10 Plus, Huawei P10, Huawei Mate 10 Pro, Huawei Mate 10, Huawei Mate 9 Pro, Huawei Mate 9, Huawei Mate 8, Honor 10, Honor 9, Vivo X20, Vivo X9, OPPO Find X, OPPO R15, OPPO R11, Mi Mix
2S, Mi Mix 2, Mi 8, Mi 6, Redmi Note 5, Google Pixel 2XL, OnePlus 6, OnePlus 5T.
Mavic 2 - Specifications, FAQs, Videos, Tutorials, Manuals - DJI
The Ipad
Mini 3 is much the same as an ipad
mini 2 rather than being a 'newer' model as the number would suggest while the ipad
mini 4 does use a faster hardware platform.
There is a list of devices based on user feedback here although the Fire HD8 might be an anomaly:
Best Tablets and Phones for DJI GO (Updated Daily) | Phantom Help