Attribute is nothing but custom taxonomy which can be predefined by site owner. So that end users/members of site can use during media upload.
You can set as many attributes as you want for media such as Photo Category, Camera Type, and Location.
After adding attributes, you will need to add terms for that attribute. For example for the attribute Camera, terms can be Digital, SLR, and DSLR. You can also edit or delete attributes.
By activating Media Attributes add-on. You can find
Attributes tab under rtMedia section.
Now, create attributes as per requirements which will display in media gallery section on your site for end users.
After that, click on
Configure button to set
terms for each attributes.
Terms are like sub-items of single
attribute. Like if you have a location as an attribute, then you can set terms as 'India', 'United States', etc. That way user can distinguish exact location where they have captured image.
Also, site admin can found all these
Media section in WordPress site backend. From there the
terms can be defined.
You may want either single or multiple terms for each attribute. For single term selection, set render type to Dropdown. For multiple selection, set render type to Checkbox while you are adding or editing any media attribute.
Please read document here gallery-shortcodes->AttributesShort-Code