Post to Document Attachment / Custom Table via API

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Posted on by silviosouza

Hi Everyone,

Can someone help with the code of a custom API to upload a attachment to the table "1173 - Document Attchament"? The payload will be:

Id(if of my custom table), fileName, fileExtension, contentBase64.

The idea here is, once a record are created in the custom table, have a api to post attchaments.

I was able to put the card page and list page to display the controls to exibht the attachments, notes and links and supporting submit attachments via BC UI.

Thank You.

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Dynamics 365 Business Central

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YUN ZHU 99,086 Super User 2026 Season 1 on at

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Hi, hope the following helps. There is an example of uploading an attachment.

Dynamics 365 Business Central: Using OData V4 unbound action (Codeunit API?) to communicate and exchange data seamlessly

https://yzhums.com/60916/

Thanks.

ZHU

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Sohail Ahmed 11,169 Super User 2026 Season 1 on at

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Hope this will give you a hint to achieve your goal. There is an example of uploading an attachment via API

https://www.youtube.com/watch?v=hEVjHlAgfbU

✅ Mark the checkbox below if this answer helped you.

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Mansi Soni 8,951 Super User 2026 Season 1 on at

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Hello,

Hope this resources might be helpful!
https://community.dynamics.com/forums/thread/details/?threadid=968e1ee9-6d25-ee11-9cbe-002248255405
https://www.bc-journal.com/post/document-attachment-on-custom-table-in-dynamics-365-business-central

Regards,
Mansi Soni

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Sumit Singh 11,757 Super User 2026 Season 1 on at

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Hi,

Just sharing few of the official links which might help:-

Upload attachment - Business Central | Microsoft Learn

Create attachment - Business Central | Microsoft Learn

documentAttachment resource type - Business Central | Microsoft Learn

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