@dereksgc it should be possible to call your own decoders similar to how gr-satellites is called via the satnogs-pre and satnogs-post scripts (satnogs-setup → Advanced → Scripts)
Similar to this thread.
In terms of the data types (such as a full resolution multi-band METOP-C DB AVHRR image in png format) and ?upload constraints? to SatNOGS DB, others here can speak to that better than I could.
Scott (satcolintel5)