How to add files using rules module? This question follows Override webform module submit

Based on this answer, I used the rules module to create a node after webform submissions.

My webform contains an &lt;input type="file" /&gt;

for other &lt;input type="text" /&gt; I used this solution to How to save webform submissions data in fields using rules module

How can I add this file data in the field-image table?
The tricky part of what you're trying to do, seems to be related to correctly specifying the filename of the attached file (= the value to be stored in your field-image field). For this, have a look at what is suggested in Comment # 25 of the support issue (not bug ...) #1431572 and which states that the correct way to do so is something like so:

[node:field-file-attachments:file:path]


Use Rules debugging

This question is pretty tough to answer with the limited info you provided (and without access to "your" site). Therefor, if needed, you might also consider some Rules debugging, by (temporary) enabling the Devel module, so that you can (temporary) add a Rules Action like "Display a value" (in your case of the entire node/webform that's used to submit that attached file). For way more details about such debugging, refer to Rules debugging, as explained in the answer to "How can I display the value of a variable inside a condition?".