Anki doesn't let me add new cards using my PC

When I try to add new cards using my pc, my Anki doesn’t let me; only when using my phone. Can anyone help me, please?

Do you get any kind of errors or something? Can you confirm that the cards are not added by going to the card browser (with the Browse button in the main window)?
Do you import the cards or add them manually?

Also see


No, I get no errors. It says the card has been successfully added, but I can only do that when using my mobile. I get no new cards. I add them manually.