in such cases I always imagine somebody who enter a restaurant. And when asked from the waiter what he like to eat and order, he only answer "I am hungry ..."
yeah, from such the staff knows "exactly" what to serve ...
It's NOT the HMI file which has to be copied on the SD card but its compiled version, the TFT file. You can find it after compiling in the Nextion IDE's menu under File -> open build folder.
Everybody is welcome. I'll send an invoice... ;-)
It was just about the RTFM fee... <:o)