To store document / image in SAP, we can use Business Document Navigator.
To go to the Business Document Navigator, choose Office -> Business Documents -> Documents -> Find (transaction code : OAOR).

SPRO:

SAP Customizing Implementation Guide -> SAP Netweaver -> Application Server -> Basis Services -> Business Document Service

When you are using transaction OAOR to store document manually, first you have to maintain table class in tcode SBDSV1

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