WordPress Multisite subdomains and sharing the same upload folder

  1. Unsure as to what you mean. You want subdomains, and subdirectories?

  2. Are you looking to save space? You might get away with symlinking the upload directories together, but as soon as one blog removes an image, it will disappear from disk from all of the other blogs that have the same image (seeing as it has the same filename).

This is a limitation of WordPress: each blog has its own media IDs and, therefore, requires their own copies of the attachments, preferrably in different upload directories.

I’d find cheaper hosting rather than try to hack together a shared upload dir.

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