It seems that's possible by using the Script Runner plugin. On this answered question, the developer of the plugin himself (Jamie Echlin) has already suggested a script that would do just that. I haven't tested it myself, but judging by the structure of the code and the variables it uses, that should work just fine.
In order to add a script to be run as post-function, you'll just have to go to the transition where you'd like to have it executed and, on the Add post function screen, you should see Script Post-Function (only after installing Script Runner). Then just provide the path to the script (be aware that JIRA should have read/write permission on this location).
By the way, you can take a look at the official documentation for Script Runner here
I will also tag your question with the label monitored by the Script Runner's developer, so he may help on this as well.
Thanks for the response!
I understand that for this kind of script i need access to JIRA folders?
I am the administrator but i use a hosting provider so i can't access JIRA folders in order to upload a file.
Where should i put the script ? under which file extension ?
Unfortunately, as Script Runner does not accept direct input of script on the UI for post-fuctions, you'll have to contact your hosting provider and check for a way to access the folders. Usually, they should provide you SSH credentials to the server, so that you can just SCP it to there from your local computer.
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