Crash uploading 600+ MB world to Realm on Nintendo Switch

I was attempting to export my main survival world from my Switch to Realms (size: circa 660mb). I click "Play on Realms" on the setting of my world. Then, waiting the exporting. BUT, when the export bar is 3/4 complete, the game will systematically crash itself ("The software was closed because an error occured."), no matter many times you're trying to export your world. I don't know what to do, I can't transfer my world to my pc without encountering this problem.