I have three Rules to do something after saving content. I need to know which one is executed first and how I can control this order?
Is there a certain answer for this question?
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Something that will help you find the answer to your question, is to have a look at Rules debugging ... Within the Rules settings, experiment a bit with the debugging facilities that come with the rules module. At least have a look at the "Rules Evaluation Log" (to check that the Rules logic being executed, actually matches what you expect that logic to be).
Depending on what the result of that type of debugging is, you may also want to (temporary) enable the Devel module, so that you can (temorary) 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 these 2 variations, refer to Rules debugging, as explained in the answer to "How can I display the value of a variable inside a condition?".
To actually control the order of execution of 3 rules, you may want to implement these 3 rules as Rules Components, and then build a 4th rule in which the Rules action is to execute these 3 rules components ... in the exact order that "you" want them to be executed.