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As my suggestion, I love PDF Reader (File scanner, File viewer, File storage) bcz i've used this app for a while to manage my large files. However, it needs to be paid first, but there is a free "lite" version at the appstore.
I'm the new user and still getting familiar with it..
But I've downloaded two apps...
PDF reader
Pocket Scanner
They're really helpful to manage my documents with different formats.