Obsidian copies the attachment into the vault to open it. On one hand, it may be suitable for images, but it is really a storage problem to copy large pdf’s into the vault from folders where the books are sorted according to their topics. I cannot delete them from their original location, and yet cannot arrange them properly and sort them into different folders under the Attachments folder.
Enable opening and editing pdf’s from original location rather than take the whole thing and copy it into the vault.
Current workaround (optional)
No workaround there natively.
Related feature requests (optional)
A better Microsoft “Edge” pdf reader and editor, to have an all-rounded reading experience. Maybe make an Additional Fileview for the pdfs being used for a particular topic with one-tap links to open from original locations. And make obsidian remember the last page which was open in the pdf before closing.