try google's own free pdf reader. some android devices have it pre-installed but if not, you can get it from play store.
or try the free adobe reader.
both will read the pdf where they find it , and will not copy it to another location
both render much faster than moon reader , for large pdf files
having two apps is better than one, you can choose the best ( for you) epub reader, t and then the best pdf reader....
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