Ok, so Minecraft Bedrock allows you to import skin packs and it mostly works fine for all users.

But when you load a skin pack that weights around 120 mb or more (Specially if one single file weights half that) it no longer works and triggers a ANR (Application Not Responding) that ends causing a crash on newer IOS and Android OS versions

This is especially noticeable with skin packs that use custom geometries (But not only) which can easily weigh that or even more due to the immense number of complex models and textures in single files

Now, causing an ANR before would not be to much of a problem because waiting a bit should fix it, but currently there is a problem because all of the most recent OS versions of Android and IOS simply close when they detect an ANR that does not want to respond after a very short period of time.

I have to note that ANRs could be present in similar processes and could cause problems in other camps like addons and texture packs, but I have'nt tested that

This issue currently only affects a small scope of players, mainly players with insane big skin packs and modified skin packs pretty much

And in case of wondering the skin pack triggers a ANR when the skin pack is loaded no matter the way, for example you set one of the Skins when logged in xbox live on Minecraft Windows then in Android you import the same skin pack and log into xbox live, the moment it tries to load the skin of the skin pack you get the ANR and the crash little after

This is not related to MCPE-164838