Uploading and Linking to an Attachment

To upload an attachment to a wiki page

1. Navigate to and open the page to which you want to add an attachment.
2. Upload the file as described in the following Atlassian help page: 
   https://confluence.atlassian.com/conf613/upload-files-964960695.html
3. To return to the contents of the page, click View Page.

To insert a link pointing to an attachment

1. Navigate to and open the page in which you want to add a link. 
2. In the page you want to change, click Edit. 
3. Click the link icon. The Insert link dialog box appears. 
4. Select Files and select the attachment. 
5. Click Insert. A link appears, with the filename as the link text, as shown in the following example: Example_document_508_compliant.doc. 
6. To display the link as a thumbnail, click the link and select Show as thumbnail. The thumbnail replaces the link text, and it is still a link, as shown in the following example: 
   

Also refer to the following Atlassian help page:

https://confluence.atlassian.com/conf613/links-964960436.html