Attachments
Explanation
Every Page of a wiki can carry files as attachments, a core feature that the Attachment API and the modules around it provide. As an administrator you decide how large an attachment may be, which file types may be uploaded at all, whether the person uploading one may summarize it and whether an attachment opens in the browser or downloads. You also decide what becomes of an attachment once it is deleted, and where the file content is kept.
Attachments reach a wiki two ways: someone attaches a file to a Page, or a client uploads one through the REST API. Either way, a file uploaded under the name of an attachment that is already there adds a version rather than replacing it, and XWiki keeps every version by default, which costs storage space; Optional Store Features is where attachment versioning is switched off.
Where the content of an attachment is kept is documented under Store rather than in this topic, so that the store settings of a wiki stay together. The Attachment Store explains how XWiki stores that content and how to keep it in the database instead, and Blob Store the blob store it writes through, whose type decides where the files finally land.
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