I design the form with the field "file" for uploading file and subsequent sending it to the subscriber or manager by email. This file is uploaded on a server into a folder ../components/com_rsform/uploads.
How properly delete these fil from server (from a folder ../components/com_rsform/uploads) after sending it attached to the email.
There is no such option in adjustments of the form (or I has not found it).

I have tried to put such scriptinto scripts tab ($thankYouMessage - after processing the form), but file was not deleted. Email is sending correctly,

I tried to place there only the text for examplebut even this text did not shown in the "thankYouMessage" window.

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Joomla 1.5.23
RSform! 1.3.0 rev 36

I know this is an old post, but I came across it while I was looking for the same thing. I solved it myself and want to post here in case someone else is looking for the same solution.

On my webhost (cPanel) I added a cronjob with the following command:

/home/USERNAME/public_html/components/com_rsform/uploads -type f -mmin +5 ! -name index.html -exec rm {} \;

This will delete any files that are older than 5 minutes (a safety buffer to make sure that RSForms! has finished processing it before it gets deleted) in the uploads folder except the system index.html file.

I hope this helps someone.