1: Format the USB or change it to another USB, will it work?
Requires USB 2.0 series not exceeding 32GB
2: Try to put the linked file into USB and plug it into the machine, can it be recognized?
https://drive.google.com/file/d/10h-oyC-jne2VcIWOd9IOOk2Eo0Tai2_R/view?usp=drive_link
Please refer to this video to reinsert the USB adapter cable, does it help?
https://drive.google.com/file/d/1W_SsPYTOFw42eHKfhhBZ86tKxS0C4Q2q/view?usp=sharing
3: The machine recognizes goo/ctb files, but does not recognize stl or obj files.
Reselect the machine and slice the file
4: Open the back cover of the machine and try to plug the USB directly into the motherboard. Can the USB files be recognized?