Added support for recognition of "application/pdf" as a valid media type has been pushed to Sigil master. The only way to truly work with an internal pdf in Sigil is to use the OpenWith menu on it in BookBrowser and choose an external pdf editor/viewer.
And as the spec says you need to add a manifest fallback using xhtml/svg so your epub can be used in epub spec compliant e-readers that will most likely not support internal pdfs.
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