Yes, you should be able to drop in a higher resolution still. Depending on the specific model hardware in your Axon some units can go to higher resolutions than others.
If you stay below 2048x2048 for stills I think you will probably be fine.
Let me know the curent size for MPEG2 And if the DL2 could play an HD content in 1920 What's the age minimum of Axon to use high resolution Because some of mine could'nt read high resolution footage