Cache pruning on Android is a system feature and you don't need to think about it. But there are situations when it's useful, for example:

  • You want to regain used space

  • You have performance issues

  • PDF Viewer application misbehaves (crashing, ...)

How to do it?

  • Launch Settings

  • Go to the Storage section

  • Select Internal shared storage - Other apps

  • Search for the PDF Viewer application

  • Tap on the Clear cache button

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