Generally, when a user is having issues uploading a file, it has to do with their network connection. To test your speed:
1. Go to SpeedTest
2. Once complete, click SHARE THIS RESULT (near the top)
3. Click the IMAGE tab, then the COPY button and send this url to support@wellcomemat.com
If you are in an office, reach out to your IT department and show them the issue as they might have some configuration that is affecting uploads.
If you continue having issues uploading, please reach out to support@wellcomemat.com.