It seems some communication gap. The first sentence of your post tells that you are able to upload Longtext bu that replaces the short text. I am simply suggesting to put that replaced text in the beginning of the Longtext and upload.
If your short text is 'This is short text' and your longtext is 'This is lontext1, This is lontext2, This is lontext3,.....' What I am suggesting is combine both to upload as longtext. like 'This is short text This is lontext1, This is lontext2, This is lontext3,.....'. Because the Operation shorttext is a part of Longtext.
Ignore if something is still not relevant to your issue.
Good luck
KJogeswaraRao