I have been working on some additions to the image\file transfer software mentioned above. When the ESP32CAM TX Arduino wants to send an image it notifies the receiver which then responds with the LoRa settings to use for the transfer. These settings can be configured on the receiver with a PC and serial terminal or Android phone. Adjusting the LoRa settings for the transfer allows for fast settings for local use and slow settings for long distance use.
What would be good is if a Slow Scan TV setup could be used, whereby the lost or error packets would not result in no valid images. In this way potentially anyone could receive the images (with bits missing maybe) rather than the single receiver approach in the software mentioned above.
The UKHAS guys do use SSTV to send images via LoRa, the TX is a Raspberry Pi and multiple receivers report packets received to an Internet server which compiles the final image.
An Arduino to Arduino SSTV setup, over LoRa would be real good, but not seen one yet.