I created a possibly helpful project that demonstrates how to load larger data from PC (Windows 10) to ESP32 via UART0 - which is a default onboard USB/TTL serial port.
It uses WPF Application to connect to the board. I hope it will help the community
The link to github and video below
Load an image bitmap via COM port and display it on LCD (ILI9341)
https://www.youtube.com/watch?v=_wxJmAGN7Mo
Load any picture via COM port and display it on LCD
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