This may not be useful to your friend but if you enable IMAPs in the Google account settings assuming this is still a thing as Google removes services almost weekly and they use an IMAP(s) client such as Thunderbird [1a][1b] then it is easier to see what files are really there and also easier to remove them. I do not use Google so I do not know if this is still an option in the Google account settings not to be confused with gmail settings.
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This may not be useful to your friend but if you enable IMAPs in the Google account settings assuming this is still a thing as Google removes services almost weekly and they use an IMAP(s) client such as Thunderbird [1a][1b] then it is easier to see what files are really there and also easier to remove them. I do not use Google so I do not know if this is still an option in the Google account settings not to be confused with gmail settings.
[1a] - https://www.thunderbird.net/en-US/mobile/
[1b] - https://www.thunderbird.net/en-US/