Hi @Kompal Sithta
Thanks for reaching out.
If you are looking to download file uploaded in document library referred as driveItem
driveitem-get-content.
GET /sites/{site-id}/drives/{drive-id}/root:/{path-relative-to-root}:/content
GET /sites/{site-id}/drives/{drive-id}/items/{item-id}/content
If you are looking to download file uploaded to a list item referred itemAttachment
, currently Microsoft Graph doesn't have support for list item attachments, you can upvote feature requested submitted by other Graph users.
Add support for SharePoint List Item Attachments in Graph
Ability to attach files to list items using Graph API.
Hope this helps.
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