While sending fax, what are the files type I can attach with it? Where can I find the required file type details?
Fax attachments types
RingCentral supports 29 file types including PDF, TIFF, DOCX, DOC, XLSX, XLS, RTF, HTML, XML and many more.
ref: https://forums.developers.ringcentral.com/questions/144/fax-faq.html
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