Currently in Minecraft for mobile it is not possible to go down to delete textures, addons and maps in the file manager.
This has been happening for a while now but recently it has gotten worse to the point where you can't see anything in the texture, addon and map selection.
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duplicates
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migrated
JervieA20
Duplicate of MCPE-187962
[Mod] EVGENSYPERPRO
Thank you for your report!
We're tracking this issue in MCPE-187962, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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