Can’t copy world over 200 MB

If I even try to delete any other worlds it will still say I can’t make a copy. I first couldn’t copy it when it made it to 100 MB but I thought it was because of the game being glitch after turning it off after leaving a call with my friend. I don’t know what might happen if I accidentally delete it on accident after spending almost 2 years on it. Hopefully you can fix it quick so I can start building again.