FreePBX FaxPro Will Not Send New Fax

[tm1000 (Andrew Nagy)]

Because in another thread he says he can send fine.

Fax Pro module document size limitations?

I am attempting to fax a 4.5MB PDF document through the UCP. After adding the document I get the message “You are currently working in offline mode.” on the top UCP message bar and the upload never shows up. The uploading bar turns green and says “uploading” but I never get the file to upload. Smaller files seem to work fine. Is there a limitation?