My son and I have been playing rather extensively on a world since the first aquatic update. We have (had?) a lot of stuff. When I saw the second aquatic update was available, I exported our world to back it up, upgraded, and we started to play the newest (v1.5.0). Shortly, it crashed, and caused my son to lose all of his items, so I thought "Easy... I have a backup!". However, trying to start again with the backed-up *.mcworld file won't work at all. Clicking "Open" from file explorer, or using the import button having launched MC normally both give the same result: almost instantaneously after "Level import started", it results in "Level import failed" with no further information. This is quite confusing. I can't even import a level exported by the same, new version.
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Change the .Mcworld file into a .zip file, then open it. If the world is inside a folder, then unzip it and put the world into the zip. then change it to .Mcworld.
it may be this glitch. This is what happened to me:
I agree it's probably this:
Btw, changing the 0 kb .mcworld file into a zip and opening it doesn't work, because it's still 0 kb, empty, void of any information. The bedrock client export world button simply does not work.
I'm having a similar issue. It's frustrating because it doesn't say what the error is just failed