There is no way to create a new folder or upload files to the box.

Hello!
I have a problem that I cannot upload new files to the box or create a new folder, because... The "new" button is missing (I'm attaching a screenshot). I went to these areas using links that a colleague sent me or I took from the miro boards. Previously, the "new" button might not be available due to lack of access. And the problem was easily solved when a colleague provided access. Now, even when transferring access, the “new” button is still missing. Plus now I can't manipulate old files either. At the same time, on the main screen the ability to create and upload files remains (I am attaching a screenshot). Now, if I go through a message in the mail about granting access to a folder, it tells me that the folder was not found (I am attaching a screenshot). At the same time, I can log in normally through the miro or the link in the message.
About two weeks ago, while I was on vacation, I received a letter from Box about the need to install two-factor verification in order to gain access to new files. I set up email verification, but even after that I still can't upload files. Colleagues were not required to provide two-factor verification and were still able to upload files.
Through the mobile version of the box, when I try to download a file, I receive the following message: “You do not have permission to download files to the folder.”
Please tell me what the problem is and how to solve it.