Our support can be contacted directly through our Help Center; however, please do not submit your documents manually. For security purposes, they must be submitted through the admin.
It sounds like you may be experiencing a browser related issue, so I would recommend clearing your cache and ensuring you are using an up to date version of Chrome. You can also try using Chrome's incognito mode as another troubleshooting step if clearing the cache doesn't help.
Please let me know if you're still unable to submit your documents in the admin after going through the steps above, and I will reach out to you directly to help!