If your MacBook OS is macOS Catalina (Version 10.15.7) /macOS Mojave (Version 11.6.7)
when you connect with the printer correctly and do printer. but the computer still notices “Printing- Sending data to printer” - Then the GFLP801 Printer didn't print.
Please don't worry, Maybe the driver has been damaged. you need to remove the printer and re-add the printer 1-3 times. the printer will work.
remove priner -> click "-". ->turn off the printer-> turn on the printer ->re-add the printer->click "+" (Please refer How do I Install Driver on Mac? )