Winshuttle will not pick up text that is entered into the Text Editor. You must instead use the Change Editor to input Long Text.
Go into the text editor. Create your loop around this process - hit Enter, enter text in the top row, and then click the next page button. Please note that each line will hold a maximum of 72 characters.
To navigate to the Text Editor, first click the Editor icon in the transaction you are recording. The position may change depending on which t-code you are in.
After clicking the Editor icon, you will see a Microsoft Word editor, but data entered there can not be captured in your recording. Instead you will want to select Goto --> Change Editor from the drop-down Menu.
Within the Text Editor, you can select the first line, hit enter, put your text into the first row and then click the Next Page.
Here is an example of the loop and the data file: