Sarafine has images that she puts on a thumb drive, and sometimes they become very pixelated. Leo says that s likely because the image is low resolution, and the metadata doesn't show that it isn't as sharp as it looks. Also, converting an image to JPEG is a mistake because it doesn't scale. So if you're using vector graphics, converting it to JPEG makes it pixelated as you change the size of it. What you want to do is change the size to what you want FIRST, and then convert it to JPEG.
Sarafina is also having issues with WiFi coverage in her house. She has dead spots in some parts of it. Why? Leo says that WiFi works best in line of sight, and you can go at least 150 feet when wide open. But when you start putting walls and furnishings in the way, then it becomes more difficult. The rule of thumb is no more than two walls between your WiFi access point and your receiver. One thing you can do is raise the level of your base station near the ceiling. That will make it clear most obstructions other than the walls. So put them up high. You can also just move the router around to a different location to get a better signal.
Another option to improve it with a WiFi extender, but repeaters slow down by half since it's constantly talking back and forth. That's why Leo now recommends Mesh Routers. You can simply add a "satellite" to improve your coverage and increase your signal strength. And since it has it's own backchannel to communicate, the speed remains.
The best is Eero. But there's also Plume.