LRC 9.3 export doesn't add to catalog

Check that you have not stacked them.

Check that you current file sort does not place them near the originals if in same folder

Where were you exporting them to? Was that folder already shown in the folders panel before exporting.

Are you looking for them in a folder? In All Photos? or in a collection?

What do you have selected in the Library module Catalog section and or are you in a Collection?

"When I export files it doesn't add them to the catalog, even though I selected the "add to catalog" checkbox."

Are you sure? Did you sort the photos capture time? The original and exported photo should appear together with this sorting.

"It also doesn't consistently allow me to select "synchronize folder" when I right-click on a folder."

It doesn't allow you to do this? What happens? Explain in detail. If there is an error message, please quote the exact complete unedited word-for-word error message.