Hey, @roberts49347804. Welcome to the Photoshop Community. I'll help you figure this out.
The 5000px limit applies to the Brush and the Adjustment Brush tool. In your case, the Mavic 4 Pro produces a file with dimensions approximately 12288 x 8192 pixels.
You can create Adjustment layers from Window > Adjustment & use Layer masks to refine further. Head here to learn more: https://adobe.ly/3IO0cBD
Here is another conversation about this: https://adobe.ly/4ogrYac;
Let me know how it goes. Thanks!
Sameer K
(Type '@' and type my name to mention me when you reply)