First it is called file manager in the options section when posting.
Couple of items to do.
First is enable file attachments
create a folder where you want the files uploaded to,
then goto
cp>feature settings-attachments
You will need to enter both paths
you can get a hint from the paths&urls section
add file types allowed and also use the test link for your paths.
Then goto
cp>display options General-primary[-]topic display options
Max Size for inline uploaded images
If an image is attached to the post, if it is smaller than the specified size (in bytes) it will be displayed in the post.
Enter a value in bytes
Then goto forum permissions and set the two items
Total # of file attachments
Maximum size of file attachments
for each group and forum you desire
remember the size is entered in bytes.
One last item would be for scaling the display size.
cp>feature settings
Max width for images used in posts?
Specified in px. Uses browser scaling. Leave blank to disable.
