itch.io

Happened to me too. Make sure you do not have space at the end of the import and also make sure that you're getting all of it. Also, transferring from one mod to another will result into "modified values".

If you want to save just the OCs, you can place the OC you'd like to copy in the extra slots, get another character you'd like to replace (a character you do not use, like the default boy), press copy all then click on your character that's in the extra slot. If you want to transfer them to another device, save it on apps meant for socializing such as Discord, Keybase, where you can copy the text on another device and do offline import.

Have you given your browser permissions to install from unknown sources?

Happens because you're installing it off your browser. It's safe tho.

You can. The only problem would be sharing the game since it's not original, but you can make your own mod.

If you're not using iOS, try enabling "install from unknown sources" on your browser. If you're still encountering problems that aren't storage related or permissions related, it's questionable.

Ask your parents to allow installing apps from unknown sources.