Whenever trying to copy world or add the experimental option to one it will give the error "Could Not Copy World".
Phone: Samsung J7 Prime
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My world is 11.9 MB large and this seems as it does affect, mostly since I have been able to copy worlds smaller than 5 MB
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-32709.
Please add a vote and any new information to the main ticket, which will be updated accordingly.
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What size is the world you are attempting to copy please? Does this affect every world?