I did clean the caches of several apps, problem still there. I can't just go into /Android/data and just delete stuff! How can I install the add-on on internal storage instead? @Jeremy wrote: You'll need to find some way of freeing up some space on whichever partition your device is using to install its apps. My phone installs apps on the internal storage, which is the problem. And your addon tries to install where it claims it's full, but I suspect it's a read-only filesystem, because it's the OS itself that is there.
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