Add epub, pdf, zip, rar, 7z, docx, xlsx, pptx, txt, csv, apk, ipa to
the MEDIA: path regex in extract_media(). These file types were already
routed to send_document() in the delivery loop (base.py:1705), but the
extraction regex only matched media extensions (audio/video/image),
causing document paths to fall through to the generic \S+ branch which
could fail silently in some cases. This explicit list ensures reliable
matching and delivery for all common document formats.
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