Using InDesign for Windows v18.5.

First of all, I TRIED to upload the InDesign file in question to this forum, and get an error message stating that uploading of InDesign files is not allowed. In an InDESIGN FORUM?

The issue here is the failure of InDesign to properly merge records from a CSV/TXT document. I have a source document (tab-delim text) and multiple fields in the InDesign document. (I am NOT trying to place multiple records per page. It's a single record with multiple tab-delim fields per page.) When I do a preview of the merge, the preview looks perfect, all records imported and in the right place. When I try to export that same merge into a PDF file, it merges ONLY the first record of the data, repeatedly, for the entire merge. I've tried recreating the file from scratch, per other users in other forums, but that doesn't work.