Not sure what is not to believe when sienci says something isnt supported yet. It’s their software.
There was a topic on development on the edge side of things going into atc and sd card stuff that you might find i teresting to read.
I believe there to be a unofficial release of gsender or edge with sd card support, but I am not looking i to that myself for I am happy with what I ha e in gsender 1.2.2.
Maybe a search in the topic finder can bring that up for you. Like this: