When compressing a lot of pictures that take up a lot of storage space, a lot of C drive storage space is occupied

[3357212328]

I compressed 47GB of pictures in one go. After the compression, I found that the available storage space of my C drive was reduced by about 20GB. However, I can't find the occupied part in the C drive. Where is the occupied part?

[Lymphatus]

Caesium uses the temp folder to store some data, usually for previews. It might be your case.