There are a few reasons this could happen:
- The file size is too large (we typically cap at 100mb)
- We keep a strict file list that we allow to be uploaded. We do this to prevent harmful files from being uploaded. If you feel this maybe the case please contact us at firstname.lastname@example.org and we will look into the file type for you.
- If it is an HTML file, we do not allow them to be uploaded. The best way to handle this would be to zip it and then upload it.