Appears that reformatting the SD card starts the photo sequence back over at 001.  Correct??  Is there a setting to prevent this?

Butt, please tell me the model of your SD card. Did you try to change a SD card in the recommended list? How did you format your SD card? Thanks for your support.
Here is the recommended list:
Sandisk 16GB UHS-1 Micro SDHC
Sandisk 32GB UHS-1 Micro SDHC
Sandisk 64GB UHS-1 Micro SDXC
Kinston 16GB UHS-1 Micro SDHC
Kinston 32GB UHS-1 Micro SDHC
Kinston 64GB UHS-1 Micro SDXC
Samsung 16G UHS-I Micro SDHC
Samsung 32G UHS-I Micro SDHC
Samsung 64G UHS-I Micro SDXC

I'm curious about this too - i.e. being able to set the numbering/naming sequence.

I see other models has this setting, but not the Spark?

Ideally I'd like to take pics/vids, backup & clear the SD between flights, so format of DJI_{YYMMDD-hhmmss}.JPG/MP4 would be ideal (as is done on my mobile/DSLR)

Is there a setting somewhere I'm missing?