unknown error when attaching files to fax

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For some reason, I receive "unknown error" today when attempting to attach a pdf file to fax.  Logging off and back on has no favorable result.  Any ideas?
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Posted 3 years ago

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Official Response

Several things could be causing that...including, but not limited to; the size of the fax, the fax file name (e.g., does it contain ampersands..&), and the number of pages in the fax attachment.

From the RingCentral KnowledgeBase article:
To prevent fax attachment issues, ensure that the following are met: 
• Ensure that the attached files are supported. The file name of attached files should not include ampersands (e.g. &) or other special characters. For more information, go to Supported File Attachments for Faxes.
• Ensure that the attachment does not exceed 200 pages.
• Ensure that the combined size of all attachments do not exceed 20 MB.

Here's the entire article regarding fax troubleshooting: