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Below is the description of various fields appearing on this page

1. Primary bitstream:Click on this button to make set the attached bitstream as the primary bitstream in the Item. Thumbnail generated for the Item will be the first image of the primary bitstream.for that bundle. If another bitstream was the primary bitstream beforehand, it will be replaced with this one. The thumbnail for the primary bitstream of the ORIGINAL bundle will be used as the main thumbnail for the item. (Note that the image media viewer currently doesn't take primary bitstreams into account, see https://github.com/DSpace/dspace-angular/issues/2310)
2. The default value appearing in this field is the attachment’s filename. However, users can replace it with the value of their choice.
3. Description: Users add a description of the attachment in this field.
4. Embargo until date: Users can select a future date to restrict public access to the attachment. Additionally, users can grant access to a specific set of users by selecting user groups.
5. Selected format: If the file extension of the uploaded attachment exists in the DSpace’s bitstream registry, the user will see the registered value for extension in this field. Users can change the value by selecting another one using the dropdown.

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