Answered
Resolution and enlargement
How can I increase the size and resolution of a photo using the iPhone Lightroom app?
If you are looking to intelligently upscale your images, you must use Lightroom for Mac or PC. See more info here: https://www.adobe.com/products/photoshop-lightroom/super-resolution.html
If you have only Lightroom Mobile, you can stretch your images to a larger pixel dimension during export. This stretches pixels, and is not a true upscale of the image. If you still want to give it a try:
Open an image, tap Share > Export As.. and under Dimension, switch to Custom, and choose the pixel amount you want for the longer side of your image. Doing this myself just now, I was able to convert a 12 MP image (3024x4032 px) to 4500x6000
AdChoices