Watermarking with Lightroom for Android

I was having trouble getting watermarks on my images using Lightroom for Android. Somebody gave me a little help and told me to try something and it seemed to help but the other night I was out and I took about 20 or so photos with my Google pixel 9 Pro and when I got home I decided to edit them and then add the watermark with Lightroom. I followed the same steps on each photo and about half of them worked and half of them never got the watermark on them. So it just doesn't seem to work consistently and I don't know why. I would really love it to work very well each and every time because quite honestly that's pretty much the only time I use Lightroom.