Upload problems on adobe contributor

I upload an archive with a vector illustration and a preview, write the title, category, tags, everything is as usual. But when I click save, the site gives me a red banner with the inscription: Failed to save some changes. Please correct the items highlighted in red below and try again. At the same time, nothing is highlighted in red in the filled fields, only a preview of the file in a red frame. At first I thought there was something wrong with the file and tried to send another one instead, but the result was the same. Then I tried to delete them, since they do not fit, but then a second red banner appeared: I could not delete some files. And the site stopped loading. I restarted the browser and went back in: these files are hanging in the "New", I tried to send them again. The result is the same. I tried to delete it. Red banner again: Failed to delete some files. I tried to upload to the site again. The result is the same. What can I do to remove them? Is this a website problem?