Thanks everyone

You need to add the file extensions to the list of allowed file extensions.

- Go to Admin -> Settings -> File Extensions yourdomain.com/yaf_admin_extensions.aspx

- Click on "Add" and enter the extensions you want to add

- Then you are able to attach any file you want to a message.

Please reply and thank you

No, the albums are only for Images. You can only attach such files to a message inside a topic. bellow the Editor on the on the post message page there is an Option, "Attach files to the post?", after you click Post, you will be redirected to the Page where you can upload files.

And Second one is the checkbox bellow the texteditor (Where you enter your message).

By default i thing the button and the checkbox doesnt show up because you need to enable the attach Files Permission to any role that you want. For example if you want to enable it for all registered users, that they should be allowed to upload and attach files to there posts you need.

You need to go to the Admin Page -> Users and Roles -> Access Masks -> and Set Upload to true.

On which access mask did you enable access?

Member, and Admin Access Mask should have Upload Access. And make also sure Member and Admin Access Mask are applied to the Member and Admin Roles on every forum.

When you are using YAF 1.9.5.5 you also need to manually Clear the Access Cache, as workaround go to Admin -> Settings - > Forums -> Click on Edit to edit a forum -> On the Edit Forum Page Click save to Clear the Cache.