No, I didn't see the checkmark. Somehow, I got past the issue I mentioned, and now I have a procedure for doing this.
I figured out how to do add the text, in this case I'm adding the file number.
I added the text to four images, with 190 to go. I set the text box to 36pt. And yet, on some images the text seems smaller than on the other. When I view the TIFF file, with the text added, in Lightroom, the text on one is smaller. Why is this?
No doubt there is a way to put a block of white behind the text, I don't know how, yet, but I'm sure there is a way.
Someone asked this question about adding a date yesterday. In addition to this LR function LR2/Mogrify is supposed to be able to do it. I don't use the program for this purpose but for what I use it for, it has a lot of options. Check it out if you can't get this to work.
I ended up typing the file name on each image using the 'Type' tool in PS. The watermark would have to be changed for each image and thus would still involve typing each file name.
Although this was tedious, it might get me some money. The store owner went though the fist group and selected several that she wants; no deal on price yet; I don't know the reason for this. I am acting as a wholesaler in this arrangement.
Another option in Lightroom is using the Export function.
During export there is an option to create a filename. You can create a unique custom filename for each file in the export, one at a time.
In the same section, you can also create a custom filename using a combination of data already available and user generated. If this is to be used with multiple images, a sequence number can be automatically added to keep the names unique.
I use the latter method when sending a group of photos out in a specific format.
BTW, this is the same export function that allows you to select the file format, image size and resolution, etc.