Wondershare lets you edit PDFs from a Mac. It is less expensive than the full version of Acrobat. A great classroom example came from an EdTechTeacher summer workshop participant. She created a Wordle, which she saved as a PDF. Then she inserted a QR code into it that linked back to additional information on her blog.
Many apps can share/copy to WebDAV. In fact, we have explored options of using Otixo as a cloud-based webDAV server. This free app seems to connect to an internally hosted WebDAV server for uploading/sharing files.