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Users can attach files to forum posts. To enable users to do this, you have to assign the Attach files permission on the forum's Security tab to the desired user roles or to all authenticated users. See Managing forum security for more details. There are also some additional settings related to attachments:
In Settings -> Community -> Forums, you can adjust the following setting:
In the properties of the Forum group web part, you can adjust the following settings:
When editing a forum in the Forums application, you can set the following property on the General tab:
When adding a post to a forum, users can enable the Attach file(s) function (if configured accordingly Forums -> Edit () forum group -> Forums -> Edit () forum -> Security).
After clicking OK, a new dialog appears where users can upload the attachments. When all desired images are uploaded, users can click Back, which takes them back to the forum.
Back in the forum thread, links to uploaded attachments are displayed with the post.