Why is the storage capacity in PikPak still occupied after deleting files?

When the file is deleted for the first time, it will enter the Trash. Please delete it again in the Trash to release the storage capacity.

What if the Trash is also emptied and the space is still occupied?

This is usually due to the space not updating immediately. You can create a folder and delete it and then empty the Trash to trigger the space to update immediately.