App on iphone taking up too much space?

I only have a phone that holds about 8GBs so I don't have too many apps on my phone in general. But I have a tumblr app that I checked in the usage part of my phone and it is taking up about 3.3GBs of space. So I know it is storing a lot of data, so I was wondering if there was an easy way to clean it or should I just delete the app and re-download it all together?

I would delete, restart my phone, the re-download. Just think it would be faster and easier.

I will reset phone and clear waste app.

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