Of all the many improvements for consoles over the years, sharing your screenshots still takes way more effort than it has any right to be. The Nintendo Switch is particularly bothersome, as you need to power it down completely before removing the microSD card and copying files to your PC.
Firmware 11.0.0 is ready to download, letting you transfer gameplay footage and screenshots off the Switch and onto another device via USB or wireless.
Connect to a computer with a USB cable, go to System Settings, Data Management and then Manage Screenshots and Videos.
The full patch notes are here. I guess I can pack my memory card reader away now and hopefully we will see more cool images from Switch games in future.