When I wanted to express something like “in order to do sth”, I used “on the purpose of doing sth” in my email toady. I’m not a native speaker so I’m not sure whether it is correct.
I wrote the sentence like this:
“Please save the file on the purpose of using it again later on”.
I searched “On the purpose of” with Google.com and found some webpages containing this phrase, but still not sure it is decent.
If this is not a frequently used phrase, could anyone here give me a substitution?