When creating a text post, you have the option to upload a Gif, document or image to your post. Please click on this link for more information how to post and reply to a post.
To add a document go to Post and Text, then you’ll be able to upload a document by clicking on the paperclip icon. Add in your text and select the document you would like to upload.
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Once selected, you will see the document uploaded and select the green arrow to upload it. This document can then be downloaded by members.