I have splitted your topic , it is not related to the beta and also it should be posted to the how-to forum
-- For adding files we have a field ... called file field
-- To embed a Youtube video, it is easy.
Install a video embeding plugin, i will give an example with
allvideos joomla plugin
1. Install all-videos joomla plugin and enable it
2. Create a text field
3. Set parameters like this, to create a 600x450 with autoplay enabled:
note we want to create a final plugin code like this:
{youtube}youtubeid|width|height|autoplay{/youtube}
[attachment=0:1fqg7xjk]<!-- ia0 -->all-videos-youtube.jpg<!-- ia0 -->[/attachment:1fqg7xjk]
4. Put field new field in a position of the item layout of your template.
5. Edit an item and tο embed this video
... re=related
put in the field the value :
DzvzEw5q-DA
6. view the item in the frontend
FOR STEP 3 be careful , every time you save field you must add AGAIN the slashes, so:
|600|450|1{/youtube}
must be changed to \|600\|450\|1{/youtube}
before clicking save for the field