I discovered some text cannot be selected in the exported PDF of a catalog. The text descriptions of products needs to be copy-able so that vendors can reuse the original descriptions easily.
Once a style was established, I used Alt click to copy and drag to the next section. Sections typically have small paragraph, image spread, in-depth paragraph, and a table with the usual short description, sku, and pricing. All of the table data can be selected.
At first, I thought there was a layering issue as some paragraphs overlap product images. Some of the select-able paragraphs already do overlap with images. First, I made the effort to reshape the bounding boxes to not overlap with any other elements. Next, I made a layer just for the paragraphs and that made no difference to whether text can be selected.
I also tried several options in the export dialog.