Hello Ratnawati Ratnawati and welcome to the Canvas Community. I have a few follow up questions. Are you logging in to the same instance of Canvas or have you changed schools and now accessing Canvas with a different URL? Were these files uploaded to your personal files through the "account" button or were they uploaded to a particular Canvas course? If they were uploaded to a course, can you still access the course and are you a student or teacher in the course?
Some additional information would help in pointing to what may be happening because it shouldn't be possible to lose files that have been successfully uploaded to Canvas but depending on your situation accessing them may occur differently.
Hello Ratnawati Ratnawati and welcome to the Canvas Community. I have a few follow up questions. Are you logging in to the same instance of Canvas or have you changed schools and now accessing Canvas with a different URL? Were these files uploaded to your personal files through the "account" button or were they uploaded to a particular Canvas course? If they were uploaded to a course, can you still access the course and are you a student or teacher in the course?
Some additional information would help in pointing to what may be happening because it shouldn't be possible to lose files that have been successfully uploaded to Canvas but depending on your situation accessing them may occur differently.
Thanks for the additional details!