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See an example of this content type
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Adding a new related resource
Go to Content > Add content > Related Resources
Assign the Related Resources block to a Section
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Drag the cross icon to place the resources in the desired order
If the block needs to appear on all pages in the section, mark the Auto Display checkbox
Click Save
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Editing an related resources
Go to Content
Using the Section filter, select the section of the related resource you want to find (and click filter)
Look in the results for an item with Related Resources in the second column (Content Type)
Click the edit button on far right
Make edits
Click Save