I don't have Photoshop, only Lightroom. When I export from that as a Jpeg 100% quality, the file renders at only 1mb. If I render as a Tiff it renders at 11mb, larger than the source which is 7.9 mb
I tried uploading the new Tiff from Lightroom to SS and I got this message:
Pictures must be at least 4.0 megapixels. This picture is 1920 x 1080 = 2,073,600 pixels (2.1 megapixels).