You may link to files uploaded with the current node using special tags. The tags will be replaced by the corresponding files. For example: Suppose you uploaded three files (in this order):
[inline:1=test] or [inline:imag1.png=test]will be replaced by
<img src=imag1.png alt=test>
[file:1=test] or [file:imag1.png=test]will be replaced by
<a href=imag1.png>test</a>
[attachment:2=test] or [attachment:file1.pdf=test]will be replaced by
<a href=file1.pdf.png>test</a>