I am currently working on a project where I have a number of large background images that I make exportable in Sketch and then have the developer download via Invison. I can see that there are a number of settings 1x 2x etc for image export. I cannot however see how I may set the jpeg compression of the image. I have done a number of tests and when I download the image from Invision it is much larger in size than if I had just used Photoshop for export and passed the image to the developer.
Is there anyway to reduce the image size?