Unable to Create New Horses

I have one horse currently and have been attempting to upload two others since yesterday evening. When I go to do so I repeatedly receive a message stating that the page is not working with the following error code "HTTP ERROR 400". Tried again today to see if it was just a temporary issue from site maintenance or my internet service but I am still getting the same message.

Hello, this is likely due to your internet speed. When clicking upload, if the data takes too long to get to the servers, it will time out and give you the error page. Your photo may be large in size, so you could try making it smaller and uploading again to see if it will work then.