My C drive is full without reason

[CH_AHN]

I've run into a strange problem recently. My computer keeps telling me that my C drive is full, so I deleted some files from Dropbox to free up space. However, a few hours later, the same message popped up again. I even tried deleting files from other folders, but nothing seems to work. According to TreeSize analysis, I have used 1.2 TB out of my 2 TB C drive, so there should be at least 500 GB free space. But it's showing only 10 GB available. I'm starting to think there's some issue going on. Do you have any idea how to fix this?

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