I think you should try to "Save File" instead of "Upload Hyper Model BimX"
Then choose to do a "single file" as a BimX (and not a pdf)
Is your mistake always present ?
Christophe - FRANCEArchicad Designer and Teacher
Archicad 15 to 25 FRA FULL
OS 11.6 Big Sur - MacBook Pro 2015 - 16Go RAM
"Quality is never an accident ; it's always the result of an intelligent effort" John Ruskin