The lesson space supports most file types. However, if a document is failing to upload the best thing to do is change the file type and try again.
The upload feature works by converting any document to a .pdf. Therefore, the best thing to try is to convert the document to a .pdf yourself (you can do this through 'Save As' in Microsoft Office, or there are many websites that offer a free pdf conversion service online) and then try and upload it again.
Also, it is important to note that special characters are not allowed in file names. E.g. " or , or ' or ; or * etc. If you have any of these in your file, please remove them, then try to upload the file again.
If you have tried the steps above and are still having problems, please email us the file with an explanation of the issue that you are having to email@example.com