We become indebted to.
Recently, after I paid for (upgraded) my BOX account, I was no longer able to see any of the folders and files I had been using.

Other information says that the folder upgrade process may take some time, so you won't be able to view it for a while. Is this normal?

Will I be able to see it if I wait for a while?
We are only contacting you regarding important files.

If you have any idea how much it will cost, I would appreciate it if you could let me know.

We apologize for the inconvenience, and thank you for your understanding.