silverstripe-dms/docs/en/documents-on-the-filesystem.md

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# Documents on the Filesystem
While the DMS architecture allows for remote storage of files, the default implementation (the `DMS` class)
stores them locally. Relations to pages and tags are persisted as many-many relationships through the SilverStripe ORM.
File locations in this implementation are structured into subfolders, in order to avoid exceeding filesystem limits.
The file name is a composite based on its database ID and the original file name. The exact location shouldn't be
relied on by custom logic, but rather retrieved through the API method `DMSDocument::getLink`.
Example:
```
dms-assets/
0/
1234~myfile.pdf
1/
2345~myotherfile.pdf
```