# Infor LN Document Central: Attachments and Document Management > Source: https://netray.co/erp-help/infor-ln-document-central-attachments-document-management > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: ERP Help ## Short answer In the Infor LN world, Document Central refers to the document and attachment layer that sits in the Infor OS portal and Infor Document Management (IDM), not to a single LN session. Users attach files to LN business objects such as orders, items and projects, and the files are stored and secured in the document service while LN keeps the link. ## Kind how-to ## System infor-ln ## Erp Infor LN ## Module Infor OS / Document Management / Attachments ## Query infor ln document central ## Alternate Queries - infor ln attachments document management - infor ln attach document to purchase order - infor document management ln ion ## Applies To Infor LN 10.x with Infor OS (Ming.le, ION) and Infor Document Management. Product naming has changed between releases, so check the terms used in your own portal. ## Steps ### How to get attachments working **Items:** - Confirm which document store your tenant or server uses: Infor Document Management through Infor OS, or the older in-LN document mechanisms. - Verify the ION connection between LN and the document service is active and that the logical ID and document types are registered. - Define the document types (for example drawing, certificate, contract) and the business objects they can attach to. - Grant roles in Infor OS and in LN so the right users can add, view and delete documents. Treat delete as a separate permission. - Test by opening a purchase order or item in the Web UI, adding an attachment, then opening it as a second user with a different role. - Set retention, size limits and a backup rule for the document store in the same change. ## Sections ### What it is and what it is not **Body:** Document Central is the user-facing document area. Behind it, Infor Document Management stores the files, indexes them and enforces access. LN stores only a reference to the document on the business object, which is why users can see an attachment icon on the order while the file itself sits elsewhere. It is not an engineering PLM and does not do revision control of drawings with approval workflows. If you need controlled engineering documents, use a PLM system and link its documents to LN items. ### Common admin problems **Body:** Most failures are connection and permission problems rather than product defects: the ION connection point is down, a certificate expired, the user lacks a role in the document service, or the file type is blocked by size or extension rules. Check the connection first, then permissions, then the file. For on-premise installations check network paths and proxy rules between the LN application server and the document service, because attachments often work in the browser but fail on the server side. ### Searching documents and keeping them private **Body:** Attachments are a large unstructured source that is rarely searched well: certificates, inspection reports, contracts. A private retrieval layer over the document store, deployed on your own infrastructure, lets users ask questions about them without sending files to a public service. The access model from the document service should carry through to the answers. ## Pitfalls - Treating attachments as backed up because LN is backed up, when the document store is separate. - Giving everyone the delete permission by default. - Letting large files accumulate with no retention rule. - Assuming an attachment icon proves the file is still reachable after a migration. ## Ai Angle Netray adds a private retrieval layer over LN data and attached documents, running on your own servers when needed. It respects the roles of the source system and can answer questions such as which supplier certificates expire this quarter. It reads, it does not alter the document store. ## Faq ### Is Document Central a session in Infor LN? **Answer:** Not in the usual sense. It is the document area of the Infor OS experience, working with Infor Document Management. LN links to it through ION and shows attachments on business objects. ### Where are LN attachments physically stored? **Answer:** In the document service or store configured for your environment, not in the LN database tables. That is why backup and retention for the document store must be planned separately. ### Why can a user see the attachment icon but not open the file? **Answer:** Usually a permission or connectivity problem with the document service. Check the role in the document service, then the ION connection, then whether the file still exists. ### Can attachments be migrated during an upgrade? **Answer:** Yes but the links must be preserved. Plan to migrate files and references together and validate a sample of each document type before cutover. ## Search terms infor ln document central, infor document management, infor ln attachments, infor ln idm, infor os document management, infor ln attach file purchase order, infor ion document service, infor ln document types --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json