Hi @quỳnh n thank you for posting in the community! I'm sorry for the trouble you are having with your account storage. Since this deals with your account and documents I am going to move this conversation to a private support ticket so we can take a closer look. Please keep an eye out for an email from our Support team!

For anyone with a similar issue there are a few specific things worth noting when working with storage:

• You can check how much of your storage is being used and what it is being used by in your Account Settings at the bottom of the left panel. If you hover over each of the colored sections you can see what that portion of the storage represents.
• Images generally take up the most space in your account if you are running out of room it is recommended that you clear out as many images as you can from both your documents and your Image Manager. You can access your Image Manager by clicking the image icon next to the magnifying glass above your shape library.
• Please note when deleting documents in order to free up storage space you will need to navigate to your trash folder and select to delete the documents from your trash as well.

If you are still having trouble with storage in your account please reply to this thread.