>>3602894No anon, if you post an image then the thread will get bumped no matter what, even if you enter sage.
If you only text post then using sage will not bring the thread to page 1 - again I do this multiple times (quite literally did it yesterday) and recommend that you try textposting but entering sage in the options field.
I don't know how else to explain other than, textpost + sage will not send the thread to page 1, I've seen it be used on /c/ multiple times. if you don't believe me then try.