Thanks a lot for your cooperation, as per Google Forms official forum reply, login is a requirement to upload images from Google Forms: Just wanted to let you know, when you ask the respondents to upload files in Google Forms, it will ask them to sign in as the image will be inserted via Google Drive.
How do I use Google Forms without signing in?
How to create a Google form that doesnt require sign-in to fillPress the new blank form button:This opens the Forms settings box.Make sure that the “Require Sign in” option is unchecked:In Google forms, click the “Send” button and copy the short link to the form. Then see that the form works without Google sign in:
Do you have to be signed in to submit a Google Form?
Normally, everyone can fill out a Google form; they do not need an account. However, if you selected the option Can submit only 1 response in your Google form, that will require the users to login.
How do I know if I submitted a Google Form?
There are two ways to do this: from your email confirmation or on the form submission confirmation page. If you check the Send me a copy of my responses box on the form, youll receive an email confirmation showing your form responses.
Where do Google forms go when submitted?
Form responses are saved in a Google spreadsheet in Google drive.