I'm really not getting why some people think 10Mb is not enough, there seems to be a lot of theory and not much practice on the part of those complaining. My camera, Lumix FZ2500, produces a "small" jpeg file along with the RAW file, this small jpeg is 1920 x 1280 pixels and, for this image, is 427kb in size;
This is it reduced to 1024 x 683 pixels which produces a 180kb file;
And this is the original image reduced to 800 x 533 pixels which gives a 133kb file.
With the 1920 x 1280 size 20 images could be uploaded without reaching the 10Mb limit and if the 1024 x 683 was used you would surely have more than enough. I used GIMP 2.10 to reduce the file size but I'm sure very similar results can be obtained with other programs, a little bit of online research might be need to show you how a certain piece of software does things but that's the way many people learn.