Just bought it on itch and tried dragging + dropping some very simple test models
The error message is meaningless
Extremely simple test model - cube with GMS's XYZ orientation markings
uvcube.zip
It's supposed to look like this (GM code - ignore tilemap layer behind model)
I also tried loading your ground.vbuff from ImportOBJ which it also can't read
Why no Open in file menu? Drag&Drop isn't overly obvious without reading itch blurb.
Just bought it on itch and tried dragging + dropping some very simple test models
The error message is meaningless
Extremely simple test model - cube with GMS's XYZ orientation markings
uvcube.zip
It's supposed to look like this (GM code - ignore tilemap layer behind model)
I also tried loading your ground.vbuff from ImportOBJ which it also can't read
Why no Open in file menu? Drag&Drop isn't overly obvious without reading itch blurb.